diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index d706a73a..aa826eb9 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -363,7 +363,6 @@ jobs:
 
   build-desktop-electron-linux:
     needs: create-release
-    if: ${{ false }}
     strategy:
       fail-fast: false
       matrix:
@@ -461,7 +460,6 @@ jobs:
 
   publish-electron-linux:
     needs: [create-release, build-desktop-electron-linux]
-    if: ${{ false }}
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
@@ -550,14 +548,14 @@ jobs:
     secrets: inherit
 
   finalize-release:
-    needs: [create-release, build-desktop-electron-macos, build-desktop-electron-windows, publish-npm, combine-electron-manifests, mobile-release]
+    needs: [create-release, build-desktop-electron-macos, build-desktop-electron-windows, build-desktop-electron-linux, publish-electron-linux, publish-npm, combine-electron-manifests, mobile-release]
     runs-on: ubuntu-latest
     env:
       DISCORD_WEBHOOK_URL: ${{ secrets.DISCORD_WEBHOOK_URL }}
       DISCORD_UPDATE_ROLE_ID: ${{ secrets.DISCORD_UPDATE_ROLE_ID }}
     steps:
       - name: Verify final Linux release asset inventory
-        if: ${{ false }}
+        if: ${{ github.event.inputs.dry_run != 'true' }}
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           REPOSITORY: ${{ github.repository }}
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 91483224..46a2667a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,9 @@ All notable changes to this project will be documented in this file.
 
 ## [Unreleased]
 
+- **Desktop/Linux:** official AppImage releases for x64 and arm64, with in-app updates from the GitHub release feed. Missing update manifests are treated as “no update” instead of a hard failure, and updater errors surface in About/sidebar (thanks to @jibanez-staticduo).
+- Desktop/Linux: frameless window controls, system tray minimize, launch at login via XDG autostart, multi-window support, and “Open in” for discovered installed apps (thanks to @jibanez-staticduo, @makeittech).
+
 ## [1.16.3] - 2026-07-22
 
 - **Chat attachments:** added Office and OpenDocument files (`.docx`, `.pptx`, `.xlsx`, `.odt`, `.odp`, and `.ods`), with readable text and supported embedded images extracted before sending. Attachments also support more source-code formats, notebooks, HAR files with credentials and cookies removed, SVG and Draw.io files, and HEIC/HEIF images; the composer warns when the selected model may ignore an attachment type.
diff --git a/README.md b/README.md
index 9c21c487..1964313b 100644
--- a/README.md
+++ b/README.md
@@ -105,7 +105,7 @@ Linux AppImages need FUSE (`libfuse.so.2`). On Ubuntu/Debian install `libfuse2`
 APPIMAGE_EXTRACT_AND_RUN=1 ./OpenChamber-*-linux-*.AppImage
 ```
 
-Linux Desktop ships as AppImage with in-app window controls and auto-update when running from a writable AppImage. System tray and launch-at-login are not available on Linux yet (macOS/Windows only).
+Linux Desktop ships as AppImage with in-app window controls and auto-update when running from a writable AppImage.
 
 ### **VS Code**
 Install from [Marketplace](https://marketplace.visualstudio.com/items?itemName=fedaykindev.openchamber) or search "OpenChamber" in Extensions.
diff --git a/packages/electron/README.md b/packages/electron/README.md
index a4db3672..04229790 100644
--- a/packages/electron/README.md
+++ b/packages/electron/README.md
@@ -88,7 +88,7 @@ Linux updates are supported only when the packaged app is running from a writabl
 
 A loopback-only updater fixture is available for contributor QA of N-to-N+1 AppImage replacement and restart behavior. It is test infrastructure, not a user-configurable update source. See [`scripts/updater-e2e-fixture.md`](./scripts/updater-e2e-fixture.md) for the controlled test procedure. Unit tests cover feed selection, check failures, no-update results, and fixture generation; actual AppImage replacement and restart remains a manual native N-to-N+1 release boundary because it requires executing two packaged versions on each supported architecture.
 
-The package supports macOS, Windows, and Linux desktop features. Linux AppImage builds include in-app window controls and auto-update; system tray and launch-at-login remain macOS/Windows only. Some native discovery helpers are platform-specific. For example, app icon fetching and app filtering currently only work on macOS, while opening files in installed apps and installed-app discovery work on macOS and Windows (Linux returns an empty list without errors).
+The package supports macOS, Windows, and Linux desktop features. Linux AppImage builds include in-app window controls, auto-update, system tray, and launch-at-login (XDG autostart). Some native discovery helpers are platform-specific. For example, app icon fetching and app filtering currently only work on macOS, while opening files in installed apps and installed-app discovery work on macOS, Windows, and Linux.
 
 The macOS menu bar item is enabled by default and can be disabled in General settings. The setting applies after restart; while disabled, Desktop does not create the native tray controller or start the renderer subscriptions, polling, quota refresh, or IPC updates that feed it.
 
diff --git a/packages/electron/linux-app-discovery.mjs b/packages/electron/linux-app-discovery.mjs
new file mode 100644
index 00000000..4c8482c3
--- /dev/null
+++ b/packages/electron/linux-app-discovery.mjs
@@ -0,0 +1,318 @@
+import fs from 'node:fs';
+import fsp from 'node:fs/promises';
+import os from 'node:os';
+import path from 'node:path';
+
+const DEFAULT_XDG_DATA_DIRS = ['/usr/local/share', '/usr/share'];
+const TARGET_FIELD_CODES = new Set(['f', 'F', 'u', 'U']);
+const TERMINAL_APP_IDS = new Set(['terminal', 'iterm2', 'ghostty']);
+
+export const LINUX_CLI_BY_APP_ID = {
+  vscode: 'code',
+  cursor: 'cursor',
+  vscodium: 'codium',
+  windsurf: 'windsurf',
+  zed: 'zed',
+  'sublime-text': 'subl',
+};
+
+const uniqueStrings = (values) => {
+  const seen = new Set();
+  const result = [];
+  for (const value of values) {
+    const candidate = typeof value === 'string' ? value.trim() : '';
+    if (!candidate || seen.has(candidate)) continue;
+    seen.add(candidate);
+    result.push(candidate);
+  }
+  return result;
+};
+
+const desktopBoolean = (value) => String(value || '').trim().toLowerCase() === 'true';
+const unescapeDesktopValue = (value) => String(value || '')
+  .replace(/\\s/g, ' ')
+  .replace(/\\n/g, '\n')
+  .replace(/\\t/g, '\t')
+  .replace(/\\r/g, '\r')
+  .replace(/\\\\/g, '\\');
+const normalizeComparable = (value) => String(value || '')
+  .toLowerCase()
+  .replace(/\.desktop$/i, '')
+  .replace(/[^a-z0-9]+/g, ' ')
+  .trim();
+const normalizeCompactComparable = (value) => normalizeComparable(value).replace(/\s+/g, '');
+
+export const stripDesktopExecFieldCodes = (execValue) => String(execValue || '')
+  .replace(/%%/g, '\^@')
+  .replace(/%[fFuUdDnNickvm]/g, '')
+  .replace(/%./g, '')
+  .replace(/\^@/g, '%')
+  .replace(/\s+/g, ' ')
+  .trim();
+
+export const linuxApplicationDirs = ({ env = process.env, homeDir = os.homedir() } = {}) => {
+  const dataHome = typeof env.XDG_DATA_HOME === 'string' && env.XDG_DATA_HOME.trim()
+    ? env.XDG_DATA_HOME.trim()
+    : path.join(homeDir || os.homedir(), '.local', 'share');
+  const dataDirs = typeof env.XDG_DATA_DIRS === 'string' && env.XDG_DATA_DIRS.trim()
+    ? env.XDG_DATA_DIRS.split(':').filter(Boolean)
+    : DEFAULT_XDG_DATA_DIRS;
+  return uniqueStrings([
+    path.join(dataHome, 'applications'),
+    ...dataDirs.map((dir) => path.join(dir, 'applications')),
+    '/usr/local/share/applications',
+    '/usr/share/applications',
+  ]).map((entry) => path.resolve(entry));
+};
+
+const parseDesktopValues = (content) => {
+  const values = new Map();
+  let group = '';
+  for (const rawLine of String(content || '').split(/\r?\n/)) {
+    const line = rawLine.trim();
+    if (!line || line.startsWith('#')) continue;
+    if (line.startsWith('[') && line.endsWith(']')) {
+      group = line.slice(1, -1).trim();
+      continue;
+    }
+    if (group !== 'Desktop Entry') continue;
+    const separator = line.indexOf('=');
+    if (separator <= 0) continue;
+    const key = line.slice(0, separator).trim();
+    if (!key || key.includes('[') || values.has(key)) continue;
+    values.set(key, unescapeDesktopValue(line.slice(separator + 1)));
+  }
+  return values;
+};
+
+export const parseDesktopEntry = (content, filePath = '') => {
+  const values = parseDesktopValues(content);
+  if ((values.get('Type') || 'Application') !== 'Application') return null;
+  if (desktopBoolean(values.get('NoDisplay')) || desktopBoolean(values.get('Hidden'))) return null;
+  const name = String(values.get('Name') || '').trim();
+  const rawExec = String(values.get('Exec') || '').trim();
+  const exec = stripDesktopExecFieldCodes(rawExec);
+  if (!name || !rawExec || !exec) return null;
+  return {
+    id: path.basename(filePath || '').replace(/\.desktop$/i, '') || name,
+    name,
+    exec,
+    rawExec,
+    icon: String(values.get('Icon') || '').trim() || null,
+    categories: String(values.get('Categories') || '').split(';').map((entry) => entry.trim()).filter(Boolean),
+    filePath,
+  };
+};
+
+const collectDesktopFiles = async (dir) => {
+  let entries;
+  try {
+    entries = await fsp.readdir(dir, { withFileTypes: true });
+  } catch {
+    return [];
+  }
+  const files = [];
+  for (const entry of entries) {
+    const candidate = path.join(dir, entry.name);
+    if (entry.isDirectory()) {
+      files.push(...await collectDesktopFiles(candidate));
+    } else if (entry.isFile() && entry.name.toLowerCase().endsWith('.desktop')) {
+      files.push(candidate);
+    }
+  }
+  return files;
+};
+
+export const readLinuxDesktopEntries = async (options = {}) => {
+  const dirs = Array.isArray(options.applicationDirs) ? options.applicationDirs : linuxApplicationDirs(options);
+  const files = [];
+  for (const dir of dirs) files.push(...await collectDesktopFiles(dir));
+  const seen = new Set();
+  const entries = [];
+  for (const filePath of files) {
+    try {
+      const parsed = parseDesktopEntry(await fsp.readFile(filePath, 'utf8'), filePath);
+      if (!parsed || seen.has(parsed.id)) continue;
+      seen.add(parsed.id);
+      entries.push(parsed);
+    } catch {
+    }
+  }
+  return entries.sort((left, right) => left.name.localeCompare(right.name));
+};
+
+export const discoverLinuxDesktopApps = readLinuxDesktopEntries;
+
+export const desktopEntryMatchesApp = (entry, appName, appId = '') => {
+  const needles = uniqueStrings([appName, appId]).flatMap((value) => [normalizeComparable(value), normalizeCompactComparable(value)]).filter(Boolean);
+  const haystacks = [entry.name, entry.id, path.basename(entry.filePath || ''), entry.exec]
+    .flatMap((value) => [normalizeComparable(value), normalizeCompactComparable(value)]);
+  return needles.some((needle) => haystacks.some((haystack) => haystack === needle || haystack.includes(needle) || needle.includes(haystack)));
+};
+
+const parseExecCommand = (exec) => {
+  const args = [];
+  let current = '';
+  let quote = null;
+  let escaped = false;
+  for (const char of String(exec || '')) {
+    if (escaped) {
+      current += char;
+      escaped = false;
+      continue;
+    }
+    if (char === '\\') {
+      escaped = true;
+      continue;
+    }
+    if (quote) {
+      if (char === quote) quote = null;
+      else current += char;
+      continue;
+    }
+    if (char === '"' || char === "'") {
+      quote = char;
+      continue;
+    }
+    if (/\s/.test(char)) {
+      if (current) {
+        args.push(current);
+        current = '';
+      }
+      continue;
+    }
+    current += char;
+  }
+  if (escaped) current += '\\';
+  if (current) args.push(current);
+  return args;
+};
+
+export const buildCommandFromDesktopExec = (entry, targetPath) => {
+  const tokens = parseExecCommand(entry?.rawExec || entry?.exec || '');
+  if (tokens.length === 0) return null;
+  let targetInserted = false;
+  const args = [];
+  for (const token of tokens.slice(1)) {
+    let rendered = token.replace(/%([a-zA-Z%])/g, (_match, code) => {
+      if (TARGET_FIELD_CODES.has(code)) {
+        targetInserted = true;
+        return targetPath;
+      }
+      if (code === 'c') return entry.name || '';
+      if (code === 'k') return entry.filePath || '';
+      if (code === '%') return '%';
+      return '';
+    });
+    rendered = rendered.trim();
+    if (rendered) args.push(rendered);
+  }
+  if (!targetInserted) args.push(targetPath);
+  return { program: tokens[0], args };
+};
+
+const commandExists = (program, env = process.env) => {
+  if (!program) return false;
+  if (program.includes(path.sep)) {
+    try {
+      fs.accessSync(program, fs.constants.X_OK);
+      return true;
+    } catch {
+      return false;
+    }
+  }
+  for (const dir of String(env.PATH || '').split(':').filter(Boolean)) {
+    try {
+      fs.accessSync(path.join(dir, program), fs.constants.X_OK);
+      return true;
+    } catch {
+    }
+  }
+  return false;
+};
+
+const findEntry = (entries, appId, appName) => entries.find((entry) => desktopEntryMatchesApp(entry, appName, appId)) || null;
+
+export const buildLinuxOpenSpecs = ({ targetPath, appId, appName, targetKind = 'path', entries = [], env = process.env }) => {
+  if (appId === 'finder') {
+    return [{ kind: 'default', targetKind, targetPath }];
+  }
+  const specs = [];
+  if (TERMINAL_APP_IDS.has(appId)) {
+    const directory = targetKind === 'file' ? path.dirname(targetPath) : targetPath;
+    const terminalEntry = findEntry(entries, appId, appName);
+    if (terminalEntry) {
+      const spec = buildCommandFromDesktopExec(terminalEntry, directory);
+      if (spec) specs.push(spec);
+    }
+    specs.push({ program: 'xdg-terminal-exec', args: ['--working-directory', directory] });
+    if (commandExists('gnome-terminal', env)) {
+      specs.push({ program: 'gnome-terminal', args: [`--working-directory=${directory}`] });
+    }
+    if (commandExists('konsole', env)) {
+      specs.push({ program: 'konsole', args: ['--workdir', directory] });
+    }
+    if (commandExists('xfce4-terminal', env)) {
+      specs.push({ program: 'xfce4-terminal', args: [`--working-directory=${directory}`] });
+    }
+    if (commandExists('x-terminal-emulator', env)) {
+      specs.push({ program: 'x-terminal-emulator', args: [] });
+    }
+    return specs;
+  }
+  const cli = LINUX_CLI_BY_APP_ID[appId];
+  if (cli && commandExists(cli, env)) {
+    specs.push({ program: cli, args: appId === 'zed' ? [targetPath] : ['-n', targetPath] });
+  }
+  const entry = findEntry(entries, appId, appName);
+  if (entry) {
+    const spec = buildCommandFromDesktopExec(entry, targetPath);
+    if (spec) specs.push(spec);
+  }
+  return specs;
+};
+
+export const filterLinuxInstalledApps = async (apps, options = {}) => {
+  const entries = options.entries || await readLinuxDesktopEntries(options);
+  const requested = Array.isArray(apps) ? apps : [];
+  return requested
+    .map((appName) => String(appName || '').trim())
+    .filter((appName) => appName && entries.some((entry) => desktopEntryMatchesApp(entry, appName)));
+};
+
+export const buildLinuxInstalledApps = async (apps, options = {}) => {
+  const entries = options.entries || await readLinuxDesktopEntries(options);
+  const env = options.env || process.env;
+  const names = uniqueStrings(Array.isArray(apps) ? apps.map(String) : []);
+  return names
+    .filter((name) => {
+      const normalized = normalizeComparable(name);
+      if (normalized === 'finder' || normalized === 'file manager' || normalized === 'file explorer') {
+        return true;
+      }
+      if (normalized === 'terminal') {
+        return true;
+      }
+      if (entries.some((entry) => desktopEntryMatchesApp(entry, name))) {
+        return true;
+      }
+      const appId = Object.entries(LINUX_CLI_BY_APP_ID).find(([, cli]) => {
+        return normalizeComparable(name).includes(normalizeComparable(cli)) || normalizeCompactComparable(name).includes(cli);
+      })?.[0];
+      // Prefer direct name→id mapping from known Open In apps.
+      const knownIdByName = new Map([
+        ['visual studio code', 'vscode'],
+        ['cursor', 'cursor'],
+        ['vscodium', 'vscodium'],
+        ['windsurf', 'windsurf'],
+        ['zed', 'zed'],
+        ['sublime text', 'sublime-text'],
+      ]);
+      const mappedId = knownIdByName.get(normalized) || appId;
+      const cli = mappedId ? LINUX_CLI_BY_APP_ID[mappedId] : '';
+      return Boolean(cli && commandExists(cli, env));
+    })
+    .map((name) => ({ name, iconDataUrl: null }));
+};
+
+export const fetchLinuxAppIcons = async () => [];
diff --git a/packages/electron/linux-autostart.mjs b/packages/electron/linux-autostart.mjs
new file mode 100644
index 00000000..8f370fda
--- /dev/null
+++ b/packages/electron/linux-autostart.mjs
@@ -0,0 +1,99 @@
+import fs from 'node:fs';
+import fsp from 'node:fs/promises';
+import os from 'node:os';
+import path from 'node:path';
+
+const AUTOSTART_FILE_NAME = 'openchamber.desktop';
+
+export const resolveLinuxAutostartDirectory = ({
+  env = process.env,
+  homeDir = os.homedir(),
+} = {}) => {
+  const configHome = typeof env.XDG_CONFIG_HOME === 'string' && env.XDG_CONFIG_HOME.trim()
+    ? env.XDG_CONFIG_HOME.trim()
+    : path.join(homeDir || os.homedir(), '.config');
+  return path.join(configHome, 'autostart');
+};
+
+export const resolveLinuxAutostartFilePath = (options = {}) =>
+  path.join(resolveLinuxAutostartDirectory(options), AUTOSTART_FILE_NAME);
+
+export const resolveLinuxLaunchExecutable = ({
+  env = process.env,
+  execPath = process.execPath,
+} = {}) => {
+  const appImage = typeof env.APPIMAGE === 'string' ? env.APPIMAGE.trim() : '';
+  if (appImage && path.isAbsolute(appImage)) {
+    return appImage;
+  }
+  return execPath;
+};
+
+const quoteDesktopExecArg = (value) => {
+  const text = String(value ?? '');
+  if (!/[ \t\n"$\\]/.test(text)) {
+    return text;
+  }
+  return `"${text.replace(/(["\\$`])/g, '\\$1')}"`;
+};
+
+export const buildLinuxAutostartDesktopEntry = ({
+  appName = 'OpenChamber',
+  executable,
+  backgroundArg,
+  env = process.env,
+  execPath = process.execPath,
+} = {}) => {
+  const launchPath = executable || resolveLinuxLaunchExecutable({ env, execPath });
+  const args = [quoteDesktopExecArg(launchPath)];
+  if (typeof backgroundArg === 'string' && backgroundArg.trim()) {
+    args.push(backgroundArg.trim());
+  }
+  return [
+    '[Desktop Entry]',
+    'Type=Application',
+    `Name=${appName}`,
+    `Exec=${args.join(' ')}`,
+    'Terminal=false',
+    'X-GNOME-Autostart-enabled=true',
+    'StartupWMClass=openchamber',
+    '',
+  ].join('\n');
+};
+
+export const readLinuxAutostartEnabled = async (options = {}) => {
+  const filePath = resolveLinuxAutostartFilePath(options);
+  try {
+    await fsp.access(filePath, fs.constants.F_OK);
+    return true;
+  } catch {
+    return false;
+  }
+};
+
+export const setLinuxAutostartEnabled = async ({
+  enabled,
+  appName = 'OpenChamber',
+  backgroundArg,
+  env = process.env,
+  execPath = process.execPath,
+  homeDir = os.homedir(),
+} = {}) => {
+  const directory = resolveLinuxAutostartDirectory({ env, homeDir });
+  const filePath = path.join(directory, AUTOSTART_FILE_NAME);
+
+  if (!enabled) {
+    await fsp.rm(filePath, { force: true });
+    return { supported: true, enabled: false, filePath };
+  }
+
+  await fsp.mkdir(directory, { recursive: true });
+  const contents = buildLinuxAutostartDesktopEntry({
+    appName,
+    backgroundArg,
+    env,
+    execPath,
+  });
+  await fsp.writeFile(filePath, contents, 'utf8');
+  return { supported: true, enabled: true, filePath };
+};
diff --git a/packages/electron/linux-autostart.test.mjs b/packages/electron/linux-autostart.test.mjs
new file mode 100644
index 00000000..66f55b8d
--- /dev/null
+++ b/packages/electron/linux-autostart.test.mjs
@@ -0,0 +1,66 @@
+import assert from 'node:assert/strict';
+import fs from 'node:fs/promises';
+import os from 'node:os';
+import path from 'node:path';
+import test from 'node:test';
+
+import {
+  buildLinuxAutostartDesktopEntry,
+  readLinuxAutostartEnabled,
+  resolveLinuxAutostartFilePath,
+  resolveLinuxLaunchExecutable,
+  setLinuxAutostartEnabled,
+} from './linux-autostart.mjs';
+
+test('prefers APPIMAGE path for Linux autostart Exec', () => {
+  assert.equal(
+    resolveLinuxLaunchExecutable({
+      env: { APPIMAGE: '/home/user/OpenChamber.AppImage' },
+      execPath: '/tmp/.mount_OpenChXXXX/openchamber',
+    }),
+    '/home/user/OpenChamber.AppImage',
+  );
+});
+
+test('builds a background autostart desktop entry', () => {
+  const entry = buildLinuxAutostartDesktopEntry({
+    executable: '/home/user/Open Chamber.AppImage',
+    backgroundArg: '--background',
+  });
+  assert.match(entry, /Type=Application/);
+  assert.match(entry, /Exec="\/home\/user\/Open Chamber\.AppImage" --background/);
+  assert.match(entry, /X-GNOME-Autostart-enabled=true/);
+});
+
+test('writes and removes the XDG autostart file', async () => {
+  const homeDir = await fs.mkdtemp(path.join(os.tmpdir(), 'openchamber-autostart-'));
+  const env = { XDG_CONFIG_HOME: path.join(homeDir, 'config') };
+  const filePath = resolveLinuxAutostartFilePath({ env, homeDir });
+
+  try {
+    assert.equal(await readLinuxAutostartEnabled({ env, homeDir }), false);
+
+    const enabled = await setLinuxAutostartEnabled({
+      enabled: true,
+      backgroundArg: '--background',
+      env: { ...env, APPIMAGE: '/opt/OpenChamber.AppImage' },
+      homeDir,
+    });
+    assert.equal(enabled.enabled, true);
+    assert.equal(enabled.filePath, filePath);
+    assert.equal(await readLinuxAutostartEnabled({ env, homeDir }), true);
+
+    const contents = await fs.readFile(filePath, 'utf8');
+    assert.match(contents, /Exec=\/opt\/OpenChamber\.AppImage --background/);
+
+    const disabled = await setLinuxAutostartEnabled({
+      enabled: false,
+      env,
+      homeDir,
+    });
+    assert.equal(disabled.enabled, false);
+    assert.equal(await readLinuxAutostartEnabled({ env, homeDir }), false);
+  } finally {
+    await fs.rm(homeDir, { recursive: true, force: true });
+  }
+});
diff --git a/packages/electron/main.mjs b/packages/electron/main.mjs
index 8deec16a..a7c0a20b 100644
--- a/packages/electron/main.mjs
+++ b/packages/electron/main.mjs
@@ -17,6 +17,18 @@ import { sanitizeRuntimeRequestHeaders } from './runtime-request-headers.mjs';
 import { assertUpdaterCapability } from './updater-capability.mjs';
 import { checkForDesktopUpdate } from './updater-check.mjs';
 import { resolveUpdaterFeed } from './updater-feed.mjs';
+import {
+  buildLinuxInstalledApps,
+  buildLinuxOpenSpecs,
+  fetchLinuxAppIcons,
+  filterLinuxInstalledApps,
+  readLinuxDesktopEntries,
+} from './linux-app-discovery.mjs';
+import {
+  readLinuxAutostartEnabled,
+  setLinuxAutostartEnabled,
+} from './linux-autostart.mjs';
+import { unsupportedAppSpecificOpenError, validateLocalPath } from './path-open-utils.mjs';
 import { mintOutsideFileGrant } from '@openchamber/web/server/lib/fs/routes.js';
 
 const execFileAsync = promisify(execFile);
@@ -44,6 +56,9 @@ const getLoginItemOptions = () => {
 };
 
 const readLoginItemSettings = () => {
+  if (process.platform === 'linux') {
+    return null;
+  }
   if (process.platform !== 'darwin' && process.platform !== 'win32') return null;
   try {
     return app.getLoginItemSettings(getLoginItemOptions());
@@ -182,6 +197,7 @@ const GITHUB_FEATURE_REQUEST_URL = 'https://github.com/openchamber/openchamber/i
 const DISCORD_INVITE_URL = 'https://discord.gg/ZYRSdnwwKA';
 const INSTALLED_APPS_CACHE_TTL_SECS = 60 * 60 * 24;
 const INSTALLED_APPS_CACHE_FILE = 'discovered-apps.json';
+const LINUX_DESKTOP_ENTRIES_CACHE_TTL_MS = 30_000;
 const OPENCODE_SHUTDOWN_GRACE_MS = 100;
 const { autoUpdater } = updaterPkg;
 
@@ -244,7 +260,7 @@ const readDesktopKeepAwakeStatus = () => {
 };
 
 const readDesktopMinimizeToTrayStatus = () => {
-  const supported = process.platform === 'win32';
+  const supported = process.platform === 'win32' || process.platform === 'linux';
   return {
     supported,
     enabled: supported && readSettingsRoot().desktopMinimizeToTrayEnabled === true,
@@ -252,7 +268,7 @@ const readDesktopMinimizeToTrayStatus = () => {
 };
 
 const shouldHideMainWindowToTray = (browserWindow) => {
-  if (process.platform !== 'win32') return false;
+  if (process.platform !== 'win32' && process.platform !== 'linux') return false;
   if (!state.trayController) return false;
   if (!browserWindow || browserWindow.isDestroyed()) return false;
   if (browserWindow.__ocMiniChat === true) return false;
@@ -1540,6 +1556,18 @@ const buildInitScript = (localOrigin, bootOutcome, apiBaseUrl = '', clientToken
   ].join('');
 };
 
+// Keep per-window init scripts aligned with state. Chooser/onboarding reloads after
+// desktop_hosts_set; if only state.initScript is updated, dom-ready reinjects a stale
+// not-configured outcome and the UI flickers on "Waiting for OpenCode".
+const syncInitScriptToWindows = (initScript = state.initScript) => {
+  if (!initScript) return;
+  for (const win of BrowserWindow.getAllWindows()) {
+    if (!win.isDestroyed()) {
+      win.__ocInitScript = initScript;
+    }
+  }
+};
+
 const computeBootOutcome = ({ envTargetUrl, probe, config, localAvailable }) => {
   const availability = { localAvailable };
   if (envTargetUrl) {
@@ -2400,6 +2428,7 @@ const createBrowserWindow = ({ label, restoreGeometry, url, runtimeConfig = {} }
     try {
       const url = new URL(raw);
       if (url.protocol === 'devtools:') return true;
+      if (url.protocol === `${UI_PROTOCOL}:`) return true;
       if (url.protocol !== 'http:' && url.protocol !== 'https:') return false;
       if (state.localOrigin) {
         try {
@@ -2447,8 +2476,11 @@ const createBrowserWindow = ({ label, restoreGeometry, url, runtimeConfig = {} }
   });
 
   browserWindow.webContents.on('dom-ready', () => {
-    const initScript = browserWindow.__ocInitScript || state.initScript;
+    // Prefer authoritative state script so hosts_set updates survive reloads even if a
+    // window still holds a pre-activation / not-configured __ocInitScript.
+    const initScript = state.initScript || browserWindow.__ocInitScript;
     if (initScript) {
+      browserWindow.__ocInitScript = initScript;
       void browserWindow.webContents.executeJavaScript(initScript).catch(() => {});
     }
   });
@@ -2499,6 +2531,7 @@ const activateMainWindow = async (url, localOrigin, bootOutcome, runtimeConfig =
     rendererRuntimeConfig.clientToken,
     rendererRuntimeConfig.requestHeaders,
   );
+  syncInitScriptToWindows(state.initScript);
 
   const mainWindow = state.mainWindow;
   if (mainWindow && !mainWindow.isDestroyed()) {
@@ -2722,8 +2755,9 @@ const createMiniChatWindow = async ({ mode, sessionId = '', directory = '', proj
     void shell.openExternal(url).catch(() => {});
   });
   browserWindow.webContents.on('dom-ready', () => {
-    const initScript = browserWindow.__ocInitScript || state.initScript;
+    const initScript = state.initScript || browserWindow.__ocInitScript;
     if (initScript) {
+      browserWindow.__ocInitScript = initScript;
       void browserWindow.webContents.executeJavaScript(initScript).catch(() => {});
     }
   });
@@ -3007,6 +3041,74 @@ const buildInstalledApps = async (apps) => {
   return results;
 };
 
+let linuxDesktopEntriesCache = { expiresAt: 0, entries: null };
+
+const getLinuxDesktopEntries = async () => {
+  const now = Date.now();
+  if (linuxDesktopEntriesCache.entries && linuxDesktopEntriesCache.expiresAt > now) {
+    return linuxDesktopEntriesCache.entries;
+  }
+  const entries = await readLinuxDesktopEntries();
+  linuxDesktopEntriesCache = { entries, expiresAt: now + LINUX_DESKTOP_ENTRIES_CACHE_TTL_MS };
+  return entries;
+};
+
+const buildPlatformInstalledApps = async (apps) => {
+  if (process.platform === 'linux') {
+    return buildLinuxInstalledApps(apps);
+  }
+  if (process.platform === 'win32') {
+    return buildWindowsInstalledApps(apps);
+  }
+  return buildInstalledApps(apps);
+};
+
+const spawnDetachedLinux = (program, args) => new Promise((resolve, reject) => {
+  const child = spawn(program, args, {
+    detached: true,
+    stdio: 'ignore',
+  });
+  let settled = false;
+  const finish = (callback, value) => {
+    if (settled) return;
+    settled = true;
+    callback(value);
+  };
+  child.once('error', (error) => finish(reject, error));
+  child.once('spawn', () => {
+    child.unref();
+    finish(resolve);
+  });
+});
+
+const runLinuxSpecChain = async (specs, appName) => {
+  if (!Array.isArray(specs) || specs.length === 0) {
+    throw new Error(`Failed to open in ${appName}: no launch candidates`);
+  }
+
+  const failures = [];
+  for (const spec of specs) {
+    if (spec.kind === 'default') {
+      if (spec.targetKind === 'file') {
+        shell.showItemInFolder(spec.targetPath);
+        return;
+      }
+      const errorMessage = await shell.openPath(spec.targetPath);
+      if (!errorMessage) return;
+      failures.push(`default opener: ${errorMessage}`);
+      continue;
+    }
+
+    try {
+      await spawnDetachedLinux(spec.program, spec.args);
+      return;
+    } catch (error) {
+      failures.push(`${spec.program}: ${error instanceof Error ? error.message : String(error)}`);
+    }
+  }
+  throw new Error(`Failed to open in ${appName}: ${failures.join('; ')}`);
+};
+
 const parseSshConfigImports = () => {
   const sshConfigPath = path.join(os.homedir(), '.ssh', 'config');
   if (!fs.existsSync(sshConfigPath)) return [];
@@ -3488,12 +3590,23 @@ const handleInvoke = async (browserWindow, command, args = {}) => {
       return APP_VERSION;
 
     case 'desktop_get_launch_at_login': {
+      if (process.platform === 'linux') {
+        return { supported: true, enabled: await readLinuxAutostartEnabled() };
+      }
       if (process.platform !== 'darwin' && process.platform !== 'win32') return { supported: false, enabled: false };
       const settings = app.getLoginItemSettings(getLoginItemOptions());
       return { supported: true, enabled: settings.openAtLogin === true };
     }
 
     case 'desktop_set_launch_at_login': {
+      if (process.platform === 'linux') {
+        const enabled = args.enabled === true;
+        return setLinuxAutostartEnabled({
+          enabled,
+          appName: app.getName(),
+          backgroundArg: BACKGROUND_START_ARG,
+        });
+      }
       if (process.platform !== 'darwin' && process.platform !== 'win32') return { supported: false, enabled: false };
       const enabled = args.enabled === true;
       const settingsArgs = {
@@ -3512,7 +3625,7 @@ const handleInvoke = async (browserWindow, command, args = {}) => {
     }
 
     case 'desktop_set_minimize_to_tray': {
-      if (process.platform !== 'win32') return { supported: false, enabled: false };
+      if (process.platform !== 'win32' && process.platform !== 'linux') return { supported: false, enabled: false };
       const enabled = args.enabled === true;
       await mutateSettingsRoot((root) => {
         root.desktopMinimizeToTrayEnabled = enabled;
@@ -3690,13 +3803,19 @@ const handleInvoke = async (browserWindow, command, args = {}) => {
     case 'desktop_open_path': {
       const targetPath = typeof args.path === 'string' ? args.path.trim() : '';
       const appName = typeof args.app === 'string' ? args.app.trim() : '';
-      if (!targetPath) throw new Error('Path is required');
+      const validated = await validateLocalPath(targetPath);
       if (process.platform === 'darwin') {
-        const openArgs = appName ? ['-a', appName, targetPath] : [targetPath];
+        const openArgs = appName ? ['-a', appName, validated.path] : [validated.path];
         spawn('open', openArgs, { detached: true, stdio: 'ignore' }).unref();
         return null;
       }
-      await shell.openPath(targetPath);
+      if (appName && process.platform !== 'linux' && process.platform !== 'win32') {
+        throw new Error(unsupportedAppSpecificOpenError('paths'));
+      }
+      const errorMessage = await shell.openPath(validated.path);
+      if (errorMessage) {
+        throw new Error(`Failed to open path: ${errorMessage}`);
+      }
       return null;
     }
 
@@ -3714,18 +3833,16 @@ const handleInvoke = async (browserWindow, command, args = {}) => {
     }
 
     case 'desktop_reveal_path': {
-      const targetPath = typeof args.path === 'string' ? args.path.trim() : '';
-      if (!targetPath) {
-        throw new Error('Path is required');
-      }
-
-      const stats = await fsp.stat(targetPath).catch(() => null);
-      if (stats?.isDirectory()) {
-        await shell.openPath(targetPath);
+      const validated = await validateLocalPath(typeof args.path === 'string' ? args.path.trim() : '');
+      if (validated.stats.isDirectory()) {
+        const errorMessage = await shell.openPath(validated.path);
+        if (errorMessage) {
+          throw new Error(`Failed to reveal path: ${errorMessage}`);
+        }
         return null;
       }
 
-      shell.showItemInFolder(targetPath);
+      shell.showItemInFolder(validated.path);
       return null;
     }
 
@@ -3736,19 +3853,31 @@ const handleInvoke = async (browserWindow, command, args = {}) => {
       if (!projectPath || !appId || !appName) {
         throw new Error('Project path, app id, and app name are required');
       }
+      const validated = await validateLocalPath(projectPath, 'Project path');
       if (process.platform === 'win32') {
         if (appId === 'finder') {
-          const error = await shell.openPath(projectPath);
+          const error = await shell.openPath(validated.path);
           if (error) throw new Error(error);
           return null;
         }
-        runSpecChain(buildWindowsOpenProjectSpecs({ projectPath, appId, appName }), appName);
+        runSpecChain(buildWindowsOpenProjectSpecs({ projectPath: validated.path, appId, appName }), appName);
+        return null;
+      }
+      if (process.platform === 'linux') {
+        const entries = await getLinuxDesktopEntries();
+        await runLinuxSpecChain(buildLinuxOpenSpecs({
+          targetPath: validated.path,
+          appId,
+          appName,
+          targetKind: 'project',
+          entries,
+        }), appName);
         return null;
       }
       if (process.platform !== 'darwin') {
-        throw new Error('desktop_open_in_app is only supported on macOS and Windows');
+        throw new Error(unsupportedAppSpecificOpenError('projects'));
       }
-      runSpecChain(buildOpenProjectSpecs({ projectPath, appId, appName }), appName);
+      runSpecChain(buildOpenProjectSpecs({ projectPath: validated.path, appId, appName }), appName);
       return null;
     }
 
@@ -3759,14 +3888,26 @@ const handleInvoke = async (browserWindow, command, args = {}) => {
       if (!filePath || !appId || !appName) {
         throw new Error('File path, app id, and app name are required');
       }
+      const validated = await validateLocalPath(filePath, 'File path');
       if (process.platform === 'win32') {
-        runSpecChain(buildWindowsOpenFileSpecs({ filePath, appId, appName }), appName);
+        runSpecChain(buildWindowsOpenFileSpecs({ filePath: validated.path, appId, appName }), appName);
+        return null;
+      }
+      if (process.platform === 'linux') {
+        const entries = await getLinuxDesktopEntries();
+        await runLinuxSpecChain(buildLinuxOpenSpecs({
+          targetPath: validated.path,
+          appId,
+          appName,
+          targetKind: 'file',
+          entries,
+        }), appName);
         return null;
       }
       if (process.platform !== 'darwin') {
-        throw new Error('desktop_open_file_in_app is only supported on macOS and Windows');
+        throw new Error(unsupportedAppSpecificOpenError('files'));
       }
-      runSpecChain(buildOpenFileSpecs({ filePath, appId, appName }), appName);
+      runSpecChain(buildOpenFileSpecs({ filePath: validated.path, appId, appName }), appName);
       return null;
     }
 
@@ -3774,8 +3915,11 @@ const handleInvoke = async (browserWindow, command, args = {}) => {
       if (process.platform === 'win32') {
         return (await buildWindowsInstalledApps(args.apps)).map((app) => app.name);
       }
+      if (process.platform === 'linux') {
+        return filterLinuxInstalledApps(args.apps);
+      }
       if (process.platform !== 'darwin') {
-        throw new Error('desktop_filter_installed_apps is only supported on macOS');
+        throw new Error('desktop_filter_installed_apps is only supported on macOS, Windows, and Linux');
       }
       if (!Array.isArray(args.apps)) return [];
       const results = await Promise.all(
@@ -3799,8 +3943,11 @@ const handleInvoke = async (browserWindow, command, args = {}) => {
         }
         return results;
       }
+      if (process.platform === 'linux') {
+        return fetchLinuxAppIcons(Array.isArray(args.apps) ? args.apps : []);
+      }
       if (process.platform !== 'darwin') {
-        throw new Error('desktop_fetch_app_icons is only supported on macOS');
+        throw new Error('desktop_fetch_app_icons is only supported on macOS, Windows, and Linux');
       }
       const names = Array.isArray(args.apps) ? args.apps : [];
       const results = [];
@@ -3825,14 +3972,12 @@ const handleInvoke = async (browserWindow, command, args = {}) => {
       const hasCache = Boolean(cache);
       const isCacheStale = !cache || (now - Number(cache.updatedAt || 0)) > INSTALLED_APPS_CACHE_TTL_SECS;
       const refresh = async () => {
-        const apps = process.platform === 'win32'
-          ? await buildWindowsInstalledApps(args.apps)
-          : await buildInstalledApps(Array.isArray(args.apps) ? args.apps : []);
+        const apps = await buildPlatformInstalledApps(Array.isArray(args.apps) ? args.apps : []);
         await fsp.mkdir(path.dirname(cachePath), { recursive: true });
         await fsp.writeFile(cachePath, JSON.stringify({ updatedAt: now, apps }, null, 2));
         emitToAllWindows('openchamber:installed-apps-updated', apps);
       };
-      if (process.platform !== 'darwin' && process.platform !== 'win32') {
+      if (process.platform !== 'darwin' && process.platform !== 'win32' && process.platform !== 'linux') {
         return { apps: [], hasCache: false, isCacheStale: false, supported: false };
       }
       if (!hasCache || isCacheStale || args.force === true) {
@@ -3862,6 +4007,7 @@ const handleInvoke = async (browserWindow, command, args = {}) => {
         localAvailable: Boolean(state.sidecarUrl || state.localOrigin),
       });
       state.initScript = buildInitScript(state.localOrigin, state.bootOutcome, state.apiBaseUrl, state.clientToken, state.requestHeaders || {});
+      syncInitScriptToWindows(state.initScript);
       log.info('[electron] hosts config updated, recomputed bootOutcome', state.bootOutcome);
       return null;
     }
@@ -4662,8 +4808,10 @@ const resolveTraySurface = () => {
 const trayIconAssets = () => {
   const dir = path.join(resourceRoot(), 'icons', 'tray');
   const statusDir = path.join(dir, 'status');
-  if (process.platform === 'win32') {
-    const iconPath = getWindowIconPath() || path.join(resourceRoot(), 'icons', 'icon.ico');
+  if (process.platform === 'win32' || process.platform === 'linux') {
+    const iconPath = process.platform === 'linux'
+      ? (getWindowIconPath() || path.join(resourceRoot(), 'icons', 'icon.png'))
+      : (getWindowIconPath() || path.join(resourceRoot(), 'icons', 'icon.ico'));
     return {
       idleIconPath: iconPath,
       unseenIconPath: iconPath,
@@ -4695,7 +4843,7 @@ const trayIconAssets = () => {
 };
 
 const setupTray = () => {
-  if (!['darwin', 'win32'].includes(process.platform) || state.trayController) return;
+  if (!['darwin', 'win32', 'linux'].includes(process.platform) || state.trayController) return;
   if (process.platform === 'darwin' && readSettingsRoot().desktopMacMenuBarEnabled === false) return;
   const assets = trayIconAssets();
   if (!fs.existsSync(assets.idleIconPath)) {
@@ -4920,6 +5068,21 @@ app.whenReady().then(async () => {
     });
   }
 
+  if (process.platform === 'linux' && app.isPackaged) {
+    try {
+      const enabled = await readLinuxAutostartEnabled();
+      if (enabled) {
+        await setLinuxAutostartEnabled({
+          enabled: true,
+          appName: app.getName(),
+          backgroundArg: BACKGROUND_START_ARG,
+        });
+      }
+    } catch (error) {
+      log.warn('[electron] failed to reconcile Linux autostart entry', error);
+    }
+  }
+
   if (isBackgroundStart) {
     const { localOrigin, bootOutcome, apiBaseUrl, clientToken, requestHeaders } = await resolveInitialUrl();
     state.localOrigin = localOrigin;
diff --git a/packages/electron/package.json b/packages/electron/package.json
index 645323b7..0ecd4e8f 100644
--- a/packages/electron/package.json
+++ b/packages/electron/package.json
@@ -40,6 +40,7 @@
     "rebuild:native": "node ./scripts/rebuild-native.mjs",
     "test:architecture": "node --test ./scripts/target-architecture.test.mjs ./scripts/verify-linux-appimage.test.mjs ./scripts/verify-update-manifest.test.mjs",
     "test:updater": "node --test ./updater-capability.test.mjs ./updater-check.test.mjs ./updater-feed.test.mjs ./scripts/updater-e2e-fixture.test.mjs",
+    "test:linux-desktop": "node --test ./linux-autostart.test.mjs && node ./scripts/smoke-linux-app-discovery.mjs && node ./scripts/smoke-path-open-utils.mjs",
     "updater:e2e:fixture": "node ./scripts/updater-e2e-fixture.mjs",
     "verify:update-manifest": "node ./scripts/verify-update-manifest.mjs",
     "package": "bun run build:web-assets && bun run prepare:opencode-cli && bun run bundle:main && bun run rebuild:native && node ./scripts/package.mjs",
diff --git a/packages/electron/path-open-utils.mjs b/packages/electron/path-open-utils.mjs
new file mode 100644
index 00000000..c83caf8e
--- /dev/null
+++ b/packages/electron/path-open-utils.mjs
@@ -0,0 +1,51 @@
+import fs from 'node:fs';
+import fsp from 'node:fs/promises';
+import path from 'node:path';
+
+const accessErrorMessage = (label, targetPath, error) => {
+  if (error?.code === 'ENOENT' || error?.code === 'ENOTDIR') {
+    return `${label} does not exist: ${targetPath}`;
+  }
+  if (error?.code === 'EACCES' || error?.code === 'EPERM') {
+    return `${label} is not accessible: ${targetPath}`;
+  }
+  return `${label} could not be checked: ${error?.message || String(error)}`;
+};
+
+export const normalizeRequiredPath = (rawPath, label = 'Path') => {
+  const targetPath = typeof rawPath === 'string' ? rawPath.trim() : '';
+  if (!targetPath) {
+    throw new Error(`${label} is required`);
+  }
+  return path.resolve(targetPath);
+};
+
+export const validateLocalPath = async (rawPath, label = 'Path') => {
+  const targetPath = normalizeRequiredPath(rawPath, label);
+  let stats;
+  try {
+    stats = await fsp.stat(targetPath);
+  } catch (error) {
+    throw new Error(accessErrorMessage(label, targetPath, error));
+  }
+
+  const accessMode = stats.isDirectory()
+    ? fs.constants.R_OK | fs.constants.X_OK
+    : fs.constants.R_OK;
+  try {
+    await fsp.access(targetPath, accessMode);
+  } catch (error) {
+    throw new Error(accessErrorMessage(label, targetPath, error));
+  }
+
+  return { path: targetPath, stats };
+};
+
+export const unsupportedAppSpecificOpenError = (targetKind, platform = process.platform) => {
+  const platformName = platform === 'linux'
+    ? 'Linux'
+    : platform === 'win32'
+      ? 'Windows'
+      : platform;
+  return `Opening ${targetKind} in a specific app is not supported on ${platformName} yet. Use the default open action instead.`;
+};
diff --git a/packages/electron/scripts/smoke-linux-app-discovery.mjs b/packages/electron/scripts/smoke-linux-app-discovery.mjs
new file mode 100644
index 00000000..dd6fc0a7
--- /dev/null
+++ b/packages/electron/scripts/smoke-linux-app-discovery.mjs
@@ -0,0 +1,112 @@
+import fs from 'node:fs/promises';
+import os from 'node:os';
+import path from 'node:path';
+
+import {
+  buildCommandFromDesktopExec,
+  buildLinuxInstalledApps,
+  buildLinuxOpenSpecs,
+  filterLinuxInstalledApps,
+  linuxApplicationDirs,
+  parseDesktopEntry,
+  readLinuxDesktopEntries,
+} from '../linux-app-discovery.mjs';
+
+const assert = (condition, message) => {
+  if (!condition) throw new Error(message);
+};
+
+const tempRoot = await fs.mkdtemp(path.join(os.tmpdir(), 'openchamber-linux-apps-'));
+try {
+  const dataHome = path.join(tempRoot, 'data-home');
+  const dataDir = path.join(tempRoot, 'system-data');
+  const userApps = path.join(dataHome, 'applications');
+  const systemApps = path.join(dataDir, 'applications');
+  await fs.mkdir(userApps, { recursive: true });
+  await fs.mkdir(systemApps, { recursive: true });
+
+  const codeDesktopPath = path.join(userApps, 'code.desktop');
+  await fs.writeFile(codeDesktopPath, [
+    '[Desktop Entry]',
+    'Type=Application',
+    'Name=Visual Studio Code',
+    'Exec="/opt/Visual Studio Code/code" --new-window %F --reuse-window %i %c %k',
+    'Icon=code',
+    'Categories=Development;IDE;',
+    '',
+  ].join('\n'), 'utf8');
+  await fs.writeFile(path.join(userApps, 'hidden.desktop'), '[Desktop Entry]\nType=Application\nName=Hidden App\nExec=hidden %f\nHidden=true\n', 'utf8');
+  await fs.writeFile(path.join(userApps, 'nodisplay.desktop'), '[Desktop Entry]\nType=Application\nName=No Display App\nExec=nodisplay %f\nNoDisplay=true\n', 'utf8');
+  await fs.writeFile(path.join(userApps, 'missing-name.desktop'), '[Desktop Entry]\nType=Application\nExec=missing %f\n', 'utf8');
+  await fs.writeFile(path.join(userApps, 'missing-exec.desktop'), '[Desktop Entry]\nType=Application\nName=Missing Exec\nIcon=missing\n', 'utf8');
+  await fs.writeFile(path.join(systemApps, 'ghostty.desktop'), '[Desktop Entry]\nType=Application\nName=Ghostty\nExec=ghostty --working-directory=%f --open-uri=%u\nIcon=ghostty\n', 'utf8');
+  await fs.writeFile(path.join(systemApps, 'plain.desktop'), '[Desktop Entry]\nType=Application\nName=Plain Editor\nExec=plain-editor --flag\nIcon=plain\n', 'utf8');
+
+  const env = { XDG_DATA_HOME: dataHome, XDG_DATA_DIRS: dataDir, PATH: '/no/such/bin' };
+  const dirs = linuxApplicationDirs({ env, homeDir: tempRoot });
+  assert(dirs.includes(userApps), 'XDG_DATA_HOME applications dir should be included');
+  assert(dirs.includes(systemApps), 'XDG_DATA_DIRS applications dir should be included');
+
+  const entries = await readLinuxDesktopEntries({ applicationDirs: [userApps, systemApps], env, homeDir: tempRoot });
+  assert(entries.length === 3, `expected 3 visible valid entries, got ${entries.length}`);
+  assert(entries.some((entry) => entry.name === 'Visual Studio Code'), 'valid desktop entry should be parsed');
+  assert(entries.some((entry) => entry.name === 'Ghostty'), 'system desktop entry should be parsed');
+  assert(entries.some((entry) => entry.name === 'Plain Editor'), 'no-placeholder entry should be parsed');
+  assert(!entries.some((entry) => entry.name === 'Hidden App'), 'Hidden=true entry should be skipped');
+  assert(!entries.some((entry) => entry.name === 'No Display App'), 'NoDisplay=true entry should be skipped');
+  assert(!entries.some((entry) => entry.name === 'Missing Exec'), 'missing Exec entry should be skipped');
+
+  const codeEntry = parseDesktopEntry(await fs.readFile(codeDesktopPath, 'utf8'), codeDesktopPath);
+  assert(codeEntry?.name === 'Visual Studio Code', 'parser should read Name');
+  assert(codeEntry?.icon === 'code', 'parser should read Icon');
+  assert(codeEntry?.categories.includes('Development'), 'parser should split Categories');
+  assert(codeEntry?.rawExec?.includes('%F'), 'parser should preserve original Exec placeholders for launch construction');
+  assert(codeEntry?.exec === '"/opt/Visual Studio Code/code" --new-window --reuse-window', `parser should expose stripped Exec metadata, got ${codeEntry?.exec}`);
+
+  const command = buildCommandFromDesktopExec(codeEntry, '/tmp/My Project');
+  assert(command?.program === '/opt/Visual Studio Code/code', 'quoted Exec program should stay intact');
+  assert(command.args.slice(0, 3).join('|') === '--new-window|/tmp/My Project|--reuse-window', `Exec %F should stay at original position, got ${command.args.join('|')}`);
+  assert(!command.args.some((arg) => arg.includes('%')), 'Exec field codes should not leak into command args');
+
+  const ghosttyEntry = entries.find((entry) => entry.name === 'Ghostty');
+  const ghosttyCommand = buildCommandFromDesktopExec(ghosttyEntry, '/tmp/My Project');
+  assert(ghosttyCommand?.args.join('|') === '--working-directory=/tmp/My Project|--open-uri=/tmp/My Project', `embedded %f/%u should be substituted in place, got ${ghosttyCommand?.args.join('|')}`);
+
+  const urlEntry = parseDesktopEntry('[Desktop Entry]\nType=Application\nName=URL Handler\nExec=url-handler --url %U\n', '/tmp/url.desktop');
+  const urlCommand = buildCommandFromDesktopExec(urlEntry, 'file:///tmp/My%20Project');
+  assert(urlCommand?.args.join('|') === '--url|file:///tmp/My%20Project', `Exec %U should substitute URL targets, got ${urlCommand?.args.join('|')}`);
+
+  const plainEntry = entries.find((entry) => entry.name === 'Plain Editor');
+  const plainCommand = buildCommandFromDesktopExec(plainEntry, '/tmp/My Project');
+  assert(plainCommand?.args.join('|') === '--flag|/tmp/My Project', `target should append when Exec has no placeholder, got ${plainCommand?.args.join('|')}`);
+
+  const installed = await filterLinuxInstalledApps(['Visual Studio Code', 'Hidden App', 'Missing App'], { entries });
+  assert(installed.length === 1 && installed[0] === 'Visual Studio Code', 'filter should return only visible installed apps');
+
+  const appInfos = await buildLinuxInstalledApps(['Visual Studio Code', 'Ghostty'], { entries });
+  assert(appInfos.length === 2, 'installed app info should include matching entries');
+  assert(appInfos.every((entry) => Object.hasOwn(entry, 'iconDataUrl')), 'installed app info should include iconDataUrl key');
+
+  const specs = buildLinuxOpenSpecs({ targetPath: '/tmp/My Project', appId: 'vscode', appName: 'Visual Studio Code', targetKind: 'project', entries, env });
+  assert(specs.length === 1, 'desktop entry should provide an opener when CLI is absent');
+  assert(specs[0].program === '/opt/Visual Studio Code/code', 'desktop entry opener should use parsed program');
+  assert(specs[0].args.includes('/tmp/My Project'), 'desktop entry opener should include target');
+
+  const terminalFileSpecs = buildLinuxOpenSpecs({ targetPath: '/tmp/My Project/file.txt', appId: 'ghostty', appName: 'Ghostty', targetKind: 'file', entries, env });
+  assert(terminalFileSpecs[0]?.program === 'ghostty', 'terminal desktop entry should be preferred when present');
+  assert(terminalFileSpecs[0]?.args.join('|') === '--working-directory=/tmp/My Project|--open-uri=/tmp/My Project', `terminal file target should use dirname, got ${terminalFileSpecs[0]?.args.join('|')}`);
+  assert(terminalFileSpecs[1]?.program === 'xdg-terminal-exec', 'terminal specs should include xdg-terminal-exec fallback after desktop entry');
+  assert(terminalFileSpecs[1]?.args.join('|') === '--working-directory|/tmp/My Project', `terminal fallback should use file dirname, got ${terminalFileSpecs[1]?.args.join('|')}`);
+
+  const fallbackTerminalSpecs = buildLinuxOpenSpecs({ targetPath: '/tmp/My Project', appId: 'terminal', appName: 'Terminal', targetKind: 'project', entries, env });
+  assert(fallbackTerminalSpecs.length >= 1, 'missing terminal desktop entry should include xdg-terminal-exec fallback');
+  assert(fallbackTerminalSpecs[0]?.program === 'xdg-terminal-exec', 'missing terminal entry should use xdg-terminal-exec first');
+  assert(fallbackTerminalSpecs[0]?.args.join('|') === '--working-directory|/tmp/My Project', `xdg-terminal-exec fallback should keep working directory args, got ${fallbackTerminalSpecs[0]?.args.join('|')}`);
+
+  const defaultSpecs = buildLinuxOpenSpecs({ targetPath: '/tmp/My Project', appId: 'finder', appName: 'Finder', targetKind: 'project', entries, env });
+  assert(defaultSpecs[0].kind === 'default', 'finder maps to safe default Linux opener spec');
+
+  console.log(JSON.stringify({ ok: true, dirs, entries: entries.map((entry) => entry.name), command, ghosttyCommand, plainCommand, installed, specs, terminalFileSpecs, fallbackTerminalSpecs, defaultSpecs }, null, 2));
+} finally {
+  await fs.rm(tempRoot, { recursive: true, force: true });
+}
diff --git a/packages/electron/scripts/smoke-path-open-utils.mjs b/packages/electron/scripts/smoke-path-open-utils.mjs
new file mode 100644
index 00000000..be11cad1
--- /dev/null
+++ b/packages/electron/scripts/smoke-path-open-utils.mjs
@@ -0,0 +1,77 @@
+import fs from 'node:fs/promises';
+import os from 'node:os';
+import path from 'node:path';
+import { validateLocalPath, unsupportedAppSpecificOpenError } from '../path-open-utils.mjs';
+
+const assert = (condition, message) => {
+  if (!condition) {
+    throw new Error(message);
+  }
+};
+
+const expectRejects = async (label, callback, expected) => {
+  try {
+    await callback();
+  } catch (error) {
+    const message = error instanceof Error ? error.message : String(error);
+    assert(message.includes(expected), `${label}: expected "${expected}" in "${message}"`);
+    return message;
+  }
+  throw new Error(`${label}: expected rejection`);
+};
+
+const tempRoot = await fs.mkdtemp(path.join(os.tmpdir(), 'openchamber-path-open-'));
+try {
+  const existingFile = path.join(tempRoot, 'existing.txt');
+  await fs.writeFile(existingFile, 'ok', 'utf8');
+
+  const validated = await validateLocalPath(existingFile);
+  assert(validated.path === existingFile, 'valid file path should resolve to the same absolute path');
+  assert(validated.stats.isFile(), 'valid file path should return file stats');
+
+  const validatedDirectory = await validateLocalPath(tempRoot, 'Directory');
+  assert(validatedDirectory.path === tempRoot, 'valid directory path should resolve to the same absolute path');
+  assert(validatedDirectory.stats.isDirectory(), 'valid directory path should return directory stats');
+
+  const missingMessage = await expectRejects(
+    'missing path',
+    () => validateLocalPath(path.join(tempRoot, 'missing.txt')),
+    'does not exist',
+  );
+  const emptyMessage = await expectRejects(
+    'empty path',
+    () => validateLocalPath('   '),
+    'Path is required',
+  );
+  const inaccessiblePath = path.join(tempRoot, 'inaccessible');
+  await fs.mkdir(inaccessiblePath, { mode: 0o700 });
+  await fs.chmod(inaccessiblePath, 0o000);
+  let inaccessibleMessage = '';
+  try {
+    inaccessibleMessage = await expectRejects(
+      'inaccessible path',
+      () => validateLocalPath(inaccessiblePath),
+      'is not accessible',
+    );
+  } finally {
+    await fs.chmod(inaccessiblePath, 0o700).catch(() => {});
+  }
+
+  const unsupported = unsupportedAppSpecificOpenError('projects', 'linux');
+  assert(
+    unsupported.includes('not supported on Linux') && unsupported.includes('default open action'),
+    'unsupported app-specific Linux message should point to default open action',
+  );
+
+  console.log(JSON.stringify({
+    ok: true,
+    validated: validated.path,
+    validatedDirectory: validatedDirectory.path,
+    missingMessage,
+    emptyMessage,
+    inaccessibleMessage,
+    unsupported,
+  }, null, 2));
+} finally {
+  await fs.rm(tempRoot, { recursive: true, force: true });
+}
diff --git a/packages/ui/src/components/views/SettingsView.tsx b/packages/ui/src/components/views/SettingsView.tsx
index 57ebd16e..90c881ee 100644
--- a/packages/ui/src/components/views/SettingsView.tsx
+++ b/packages/ui/src/components/views/SettingsView.tsx
@@ -274,6 +274,10 @@ export const SettingsView: React.FC<SettingsViewProps> = ({ onClose, forceMobile
     return isDesktopShell() && typeof window !== 'undefined'
       && (window as unknown as { __OPENCHAMBER_PLATFORM__?: string }).__OPENCHAMBER_PLATFORM__ === 'win32';
   }, []);
+  const isLinux = React.useMemo(() => {
+    return isDesktopShell() && typeof window !== 'undefined'
+      && (window as unknown as { __OPENCHAMBER_PLATFORM__?: string }).__OPENCHAMBER_PLATFORM__ === 'linux';
+  }, []);
 
   // keep platform check available for future window chrome tweaks
 
@@ -417,12 +421,12 @@ export const SettingsView: React.FC<SettingsViewProps> = ({ onClose, forceMobile
   const settingsSearchResults = React.useMemo(() => {
     return buildSettingsSearchResults({
       query: settingsSearchQuery,
-      runtimeCtx: { ...runtimeCtx, isDesktopLocalOrigin, isMac, isWindows },
+      runtimeCtx: { ...runtimeCtx, isDesktopLocalOrigin, isMac, isWindows, isLinux },
       visiblePageSlugs,
       t,
       getPageTitle,
     });
-  }, [getPageTitle, isDesktopLocalOrigin, isMac, isWindows, runtimeCtx, settingsSearchQuery, t, visiblePageSlugs]);
+  }, [getPageTitle, isDesktopLocalOrigin, isMac, isWindows, isLinux, runtimeCtx, settingsSearchQuery, t, visiblePageSlugs]);
 
   const prepareSettingsSearchTarget = React.useCallback((result: SettingsSearchResult): string => {
     if (result.id.startsWith('agents.')) {
diff --git a/packages/ui/src/hooks/useTraySync.ts b/packages/ui/src/hooks/useTraySync.ts
index 93268460..0348f34e 100644
--- a/packages/ui/src/hooks/useTraySync.ts
+++ b/packages/ui/src/hooks/useTraySync.ts
@@ -104,7 +104,7 @@ type DesktopBridgeGlobal = {
 const isTrayPlatform = (): boolean => {
   if (typeof window === 'undefined') return false;
   const platform = (window as unknown as { __OPENCHAMBER_PLATFORM__?: string }).__OPENCHAMBER_PLATFORM__;
-  return platform === 'darwin' || platform === 'win32';
+  return platform === 'darwin' || platform === 'win32' || platform === 'linux';
 };
 
 const isTrayEnabled = (): boolean =>
diff --git a/packages/ui/src/lib/desktop.ts b/packages/ui/src/lib/desktop.ts
index 2379463c..1c2ab633 100644
--- a/packages/ui/src/lib/desktop.ts
+++ b/packages/ui/src/lib/desktop.ts
@@ -661,6 +661,9 @@ export const checkForDesktopUpdates = async (): Promise<UpdateInfo | null> => {
     return null;
   }
 
+  // Propagate updater capability / feed errors so the UI can show actionable
+  // messages (missing AppImage, read-only path, network failure). Missing
+  // latest-linux*.yml is already normalized to available:false in main.
   const info = await invokeDesktop<UpdateInfo>('desktop_check_for_updates');
   return info as UpdateInfo;
 };
diff --git a/packages/ui/src/lib/i18n/messages/en.settings.ts b/packages/ui/src/lib/i18n/messages/en.settings.ts
index 6ce2f82e..692c5b8b 100644
--- a/packages/ui/src/lib/i18n/messages/en.settings.ts
+++ b/packages/ui/src/lib/i18n/messages/en.settings.ts
@@ -954,7 +954,7 @@ export const settingsDict = {
   'settings.openchamber.desktopNetwork.field.macMenuBarDescription': 'Requires an app restart. When off, OpenChamber does not create the menu bar item or run its session, approval, and usage updates.',
   'settings.openchamber.desktopNetwork.field.minimizeToTrayAria': 'Minimize and close OpenChamber to the system tray',
   'settings.openchamber.desktopNetwork.field.minimizeToTray': 'Minimize and close to the system tray',
-  'settings.openchamber.desktopNetwork.field.minimizeToTrayDescription': 'Keeps OpenChamber running in the Windows system tray when the main window is minimized or closed.',
+  'settings.openchamber.desktopNetwork.field.minimizeToTrayDescription': 'Keeps OpenChamber running in the system tray when the main window is minimized or closed.',
   'settings.openchamber.desktopNetwork.field.keepAwakeAria': 'Keep computer awake while OpenChamber is running',
   'settings.openchamber.desktopNetwork.field.keepAwake': 'Keep computer awake while OpenChamber is running',
   'settings.openchamber.desktopNetwork.field.keepAwakeDescription': 'Prevents system sleep so phones can keep reaching this app. The screen can still turn off.',
diff --git a/packages/ui/src/lib/i18n/messages/es.settings.ts b/packages/ui/src/lib/i18n/messages/es.settings.ts
index 89baaf06..9e9708ee 100644
--- a/packages/ui/src/lib/i18n/messages/es.settings.ts
+++ b/packages/ui/src/lib/i18n/messages/es.settings.ts
@@ -921,7 +921,7 @@ export const settingsDict = {
   "settings.openchamber.desktopNetwork.field.macMenuBarDescription": "Requiere reiniciar la aplicación. Al desactivarlo, OpenChamber no crea el elemento de la barra de menús ni ejecuta sus actualizaciones de sesiones, aprobaciones y uso.",
   "settings.openchamber.desktopNetwork.field.minimizeToTrayAria": "Minimizar y cerrar OpenChamber a la bandeja del sistema",
   "settings.openchamber.desktopNetwork.field.minimizeToTray": "Minimizar y cerrar a la bandeja del sistema",
-  "settings.openchamber.desktopNetwork.field.minimizeToTrayDescription": "Mantiene OpenChamber en ejecución en la bandeja del sistema de Windows cuando la ventana principal se minimiza o se cierra.",
+  "settings.openchamber.desktopNetwork.field.minimizeToTrayDescription": "Mantiene OpenChamber en ejecución en la bandeja del sistema cuando la ventana principal se minimiza o se cierra.",
   "settings.openchamber.desktopNetwork.field.keepAwakeAria": "Mantener el ordenador activo mientras OpenChamber está en ejecución",
   "settings.openchamber.desktopNetwork.field.keepAwake": "Mantener el ordenador activo mientras OpenChamber está en ejecución",
   "settings.openchamber.desktopNetwork.field.keepAwakeDescription": "Para que los teléfonos puedan seguir abriendo esta app. La pantalla aún puede apagarse.",
diff --git a/packages/ui/src/lib/i18n/messages/fr.settings.ts b/packages/ui/src/lib/i18n/messages/fr.settings.ts
index a6aa451b..7633107f 100644
--- a/packages/ui/src/lib/i18n/messages/fr.settings.ts
+++ b/packages/ui/src/lib/i18n/messages/fr.settings.ts
@@ -842,7 +842,7 @@ export const settingsDict = {
   'settings.openchamber.desktopNetwork.field.macMenuBarDescription': 'Nécessite un redémarrage de l\'application. Lorsque cette option est désactivée, OpenChamber ne crée pas l\'élément de barre des menus et n\'exécute pas ses mises à jour de sessions, d\'approbations et d\'utilisation.',
   'settings.openchamber.desktopNetwork.field.minimizeToTrayAria': 'Réduire et fermer OpenChamber dans la zone de notification',
   'settings.openchamber.desktopNetwork.field.minimizeToTray': 'Réduire et fermer dans la zone de notification',
-  'settings.openchamber.desktopNetwork.field.minimizeToTrayDescription': 'Garde OpenChamber actif dans la zone de notification Windows lorsque la fenêtre principale est réduite ou fermée.',
+  'settings.openchamber.desktopNetwork.field.minimizeToTrayDescription': 'Garde OpenChamber actif dans la zone de notification lorsque la fenêtre principale est réduite ou fermée.',
   'settings.openchamber.desktopNetwork.field.keepAwakeAria': 'Garder l\'ordinateur éveillé pendant qu\'OpenChamber fonctionne',
   'settings.openchamber.desktopNetwork.field.keepAwake': 'Garder l\'ordinateur éveillé pendant qu\'OpenChamber fonctionne',
   'settings.openchamber.desktopNetwork.field.keepAwakeDescription': 'Pour que les téléphones puissent continuer à ouvrir cette application. L\'écran peut toujours s\'éteindre.',
diff --git a/packages/ui/src/lib/i18n/messages/ja.settings.ts b/packages/ui/src/lib/i18n/messages/ja.settings.ts
index 478d5fdb..d052e735 100644
--- a/packages/ui/src/lib/i18n/messages/ja.settings.ts
+++ b/packages/ui/src/lib/i18n/messages/ja.settings.ts
@@ -954,7 +954,7 @@ export const settingsDict = {
   'settings.openchamber.desktopNetwork.field.macMenuBarDescription': 'アプリの再起動が必要です。オフにすると、OpenChamber はメニューバー項目を作成せず、セッション、承認、使用量の更新も実行しません。',
   'settings.openchamber.desktopNetwork.field.minimizeToTrayAria': 'OpenChamber をシステムトレイへ最小化または閉じる',
   'settings.openchamber.desktopNetwork.field.minimizeToTray': 'システムトレイへ最小化または閉じる',
-  'settings.openchamber.desktopNetwork.field.minimizeToTrayDescription': 'メインウィンドウを最小化または閉じたときも、OpenChamber を Windows のシステムトレイで実行し続けます。',
+  'settings.openchamber.desktopNetwork.field.minimizeToTrayDescription': 'メインウィンドウを最小化または閉じたときも、OpenChamber をシステムトレイで実行し続けます。',
   'settings.openchamber.desktopNetwork.field.keepAwakeAria': 'OpenChamber の実行中はコンピューターのスリープを防止',
   'settings.openchamber.desktopNetwork.field.keepAwake': 'OpenChamber の実行中はコンピューターのスリープを防止',
   'settings.openchamber.desktopNetwork.field.keepAwakeDescription': 'スマートフォンがこのアプリを開き続けられるようにします。ディスプレイはオフにできます。',
diff --git a/packages/ui/src/lib/i18n/messages/ko.settings.ts b/packages/ui/src/lib/i18n/messages/ko.settings.ts
index 5066f388..ed71de4d 100644
--- a/packages/ui/src/lib/i18n/messages/ko.settings.ts
+++ b/packages/ui/src/lib/i18n/messages/ko.settings.ts
@@ -921,7 +921,7 @@ export const settingsDict = {
   'settings.openchamber.desktopNetwork.field.macMenuBarDescription': '앱을 다시 시작해야 합니다. 끄면 OpenChamber가 메뉴 막대 항목을 만들지 않으며 세션, 승인 및 사용량 업데이트도 실행하지 않습니다.',
   'settings.openchamber.desktopNetwork.field.minimizeToTrayAria': 'OpenChamber를 시스템 트레이로 최소화하거나 닫기',
   'settings.openchamber.desktopNetwork.field.minimizeToTray': '시스템 트레이로 최소화하고 닫기',
-  'settings.openchamber.desktopNetwork.field.minimizeToTrayDescription': '메인 창을 최소화하거나 닫아도 OpenChamber가 Windows 시스템 트레이에서 계속 실행됩니다.',
+  'settings.openchamber.desktopNetwork.field.minimizeToTrayDescription': '메인 창을 최소화하거나 닫아도 OpenChamber가 시스템 트레이에서 계속 실행됩니다.',
   'settings.openchamber.desktopNetwork.field.keepAwakeAria': 'OpenChamber가 실행되는 동안 컴퓨터 절전 방지',
   'settings.openchamber.desktopNetwork.field.keepAwake': 'OpenChamber가 실행되는 동안 컴퓨터 절전 방지',
   'settings.openchamber.desktopNetwork.field.keepAwakeDescription': '휴대폰이 이 앱을 계속 열 수 있도록 합니다. 디스플레이는 꺼질 수 있습니다.',
diff --git a/packages/ui/src/lib/i18n/messages/pl.settings.ts b/packages/ui/src/lib/i18n/messages/pl.settings.ts
index 1699f680..e0e47eab 100644
--- a/packages/ui/src/lib/i18n/messages/pl.settings.ts
+++ b/packages/ui/src/lib/i18n/messages/pl.settings.ts
@@ -761,7 +761,7 @@ export const settingsDict = {
   'settings.openchamber.desktopNetwork.field.macMenuBarDescription': 'Wymaga ponownego uruchomienia aplikacji. Po wyłączeniu OpenChamber nie tworzy elementu paska menu ani nie uruchamia aktualizacji sesji, zatwierdzeń i użycia.',
   'settings.openchamber.desktopNetwork.field.minimizeToTrayAria': 'Minimalizuj i zamykaj OpenChamber do zasobnika systemowego',
   'settings.openchamber.desktopNetwork.field.minimizeToTray': 'Minimalizuj i zamykaj do zasobnika systemowego',
-  'settings.openchamber.desktopNetwork.field.minimizeToTrayDescription': 'Utrzymuje OpenChamber w zasobniku systemowym Windows, gdy główne okno jest zminimalizowane lub zamknięte.',
+  'settings.openchamber.desktopNetwork.field.minimizeToTrayDescription': 'Utrzymuje OpenChamber w zasobniku systemowym, gdy główne okno jest zminimalizowane lub zamknięte.',
   'settings.openchamber.desktopNetwork.field.keepAwakeAria': 'Utrzymuj komputer aktywny, gdy OpenChamber jest uruchomiony',
   'settings.openchamber.desktopNetwork.field.keepAwake': 'Utrzymuj komputer aktywny, gdy OpenChamber jest uruchomiony',
   'settings.openchamber.desktopNetwork.field.keepAwakeDescription': 'Aby telefony nadal mogły otwierać tę aplikację. Ekran nadal może się wyłączyć.',
diff --git a/packages/ui/src/lib/i18n/messages/pt-BR.settings.ts b/packages/ui/src/lib/i18n/messages/pt-BR.settings.ts
index 3f4b08be..635a98f3 100644
--- a/packages/ui/src/lib/i18n/messages/pt-BR.settings.ts
+++ b/packages/ui/src/lib/i18n/messages/pt-BR.settings.ts
@@ -921,7 +921,7 @@ export const settingsDict = {
   "settings.openchamber.desktopNetwork.field.macMenuBarDescription": "Exige reiniciar o aplicativo. Quando desativado, o OpenChamber não cria o item da barra de menus nem executa as atualizações de sessões, aprovações e uso.",
   "settings.openchamber.desktopNetwork.field.minimizeToTrayAria": "Minimizar e fechar o OpenChamber na bandeja do sistema",
   "settings.openchamber.desktopNetwork.field.minimizeToTray": "Minimizar e fechar na bandeja do sistema",
-  "settings.openchamber.desktopNetwork.field.minimizeToTrayDescription": "Mantém o OpenChamber em execução na bandeja do sistema do Windows quando a janela principal é minimizada ou fechada.",
+  "settings.openchamber.desktopNetwork.field.minimizeToTrayDescription": "Mantém o OpenChamber em execução na bandeja do sistema quando a janela principal é minimizada ou fechada.",
   "settings.openchamber.desktopNetwork.field.keepAwakeAria": "Manter o computador ativo enquanto o OpenChamber estiver em execução",
   "settings.openchamber.desktopNetwork.field.keepAwake": "Manter o computador ativo enquanto o OpenChamber estiver em execução",
   "settings.openchamber.desktopNetwork.field.keepAwakeDescription": "Para que telefones continuem abrindo este app. A tela ainda pode desligar.",
diff --git a/packages/ui/src/lib/i18n/messages/uk.settings.ts b/packages/ui/src/lib/i18n/messages/uk.settings.ts
index c590e73a..308718a6 100644
--- a/packages/ui/src/lib/i18n/messages/uk.settings.ts
+++ b/packages/ui/src/lib/i18n/messages/uk.settings.ts
@@ -921,7 +921,7 @@ export const settingsDict = {
   "settings.openchamber.desktopNetwork.field.macMenuBarDescription": "Потребує перезапуску застосунку. Якщо вимкнено, OpenChamber не створює елемент смуги меню та не запускає пов’язані оновлення сесій, запитів на підтвердження й використання.",
   "settings.openchamber.desktopNetwork.field.minimizeToTrayAria": "Згортати й закривати OpenChamber у системний трей",
   "settings.openchamber.desktopNetwork.field.minimizeToTray": "Згортати й закривати в системний трей",
-  "settings.openchamber.desktopNetwork.field.minimizeToTrayDescription": "Залишає OpenChamber запущеним у системному треї Windows, коли головне вікно згорнуто або закрито.",
+  "settings.openchamber.desktopNetwork.field.minimizeToTrayDescription": "Залишає OpenChamber запущеним у системному треї, коли головне вікно згорнуто або закрито.",
   "settings.openchamber.desktopNetwork.field.keepAwakeAria": "Не давати комп’ютеру засинати, поки OpenChamber запущено",
   "settings.openchamber.desktopNetwork.field.keepAwake": "Не давати комп’ютеру засинати, поки OpenChamber запущено",
   "settings.openchamber.desktopNetwork.field.keepAwakeDescription": "Щоб телефон і далі міг відкривати застосунок. Екран усе одно може вимикатися.",
diff --git a/packages/ui/src/lib/i18n/messages/zh-CN.settings.ts b/packages/ui/src/lib/i18n/messages/zh-CN.settings.ts
index 0373577b..686dd99b 100644
--- a/packages/ui/src/lib/i18n/messages/zh-CN.settings.ts
+++ b/packages/ui/src/lib/i18n/messages/zh-CN.settings.ts
@@ -921,7 +921,7 @@ export const settingsDict = {
   'settings.openchamber.desktopNetwork.field.macMenuBarDescription': '需要重启应用。关闭后，OpenChamber 不会创建菜单栏项目，也不会运行相关的会话、审批和用量更新。',
   'settings.openchamber.desktopNetwork.field.minimizeToTrayAria': '将 OpenChamber 最小化和关闭到系统托盘',
   'settings.openchamber.desktopNetwork.field.minimizeToTray': '最小化和关闭到系统托盘',
-  'settings.openchamber.desktopNetwork.field.minimizeToTrayDescription': '主窗口最小化或关闭时，让 OpenChamber 继续在 Windows 系统托盘中运行。',
+  'settings.openchamber.desktopNetwork.field.minimizeToTrayDescription': '主窗口最小化或关闭时，让 OpenChamber 继续在系统托盘中运行。',
   'settings.openchamber.desktopNetwork.field.keepAwakeAria': 'OpenChamber 运行时保持电脑唤醒',
   'settings.openchamber.desktopNetwork.field.keepAwake': 'OpenChamber 运行时保持电脑唤醒',
   'settings.openchamber.desktopNetwork.field.keepAwakeDescription': '让手机可以继续打开此应用。屏幕仍可关闭。',
diff --git a/packages/ui/src/lib/i18n/messages/zh-TW.settings.ts b/packages/ui/src/lib/i18n/messages/zh-TW.settings.ts
index 15d61334..9645d467 100644
--- a/packages/ui/src/lib/i18n/messages/zh-TW.settings.ts
+++ b/packages/ui/src/lib/i18n/messages/zh-TW.settings.ts
@@ -1933,7 +1933,7 @@
   'settings.openchamber.desktopNetwork.field.macMenuBarDescription': '需要重新啟動應用程式。關閉後，OpenChamber 不會建立選單列項目，也不會執行相關的工作階段、核准與用量更新。',
   'settings.openchamber.desktopNetwork.field.minimizeToTrayAria': '將 OpenChamber 最小化和關閉到系統匣',
   'settings.openchamber.desktopNetwork.field.minimizeToTray': '最小化和關閉到系統匣',
-  'settings.openchamber.desktopNetwork.field.minimizeToTrayDescription': '主視窗最小化或關閉時，讓 OpenChamber 繼續在 Windows 系統匣中執行。',
+  'settings.openchamber.desktopNetwork.field.minimizeToTrayDescription': '主視窗最小化或關閉時，讓 OpenChamber 繼續在系統匣中執行。',
   'settings.openchamber.desktopNetwork.field.keepAwakeAria': 'OpenChamber 執行時保持電腦喚醒',
   'settings.openchamber.desktopNetwork.field.keepAwake': 'OpenChamber 執行時保持電腦喚醒',
   'settings.openchamber.desktopNetwork.field.keepAwakeDescription': '讓手機可以持續開啟此應用程式。螢幕仍可關閉。',
diff --git a/packages/ui/src/lib/openInApps.ts b/packages/ui/src/lib/openInApps.ts
index 84049711..663db849 100644
--- a/packages/ui/src/lib/openInApps.ts
+++ b/packages/ui/src/lib/openInApps.ts
@@ -35,10 +35,18 @@ export const DEFAULT_OPEN_IN_APP_ID = 'finder';
 export const OPEN_IN_ALWAYS_AVAILABLE_APP_IDS = new Set(['finder', 'terminal']);
 
 export const getPlatformOpenInApp = (app: OpenInApp): OpenInApp => {
-  if (typeof window !== 'undefined' && window.__OPENCHAMBER_PLATFORM__ === 'win32') {
-    if (app.id === 'finder') {
+  if (typeof window === 'undefined') {
+    return app;
+  }
+
+  const platform = window.__OPENCHAMBER_PLATFORM__;
+  if (app.id === 'finder') {
+    if (platform === 'win32') {
       return { ...app, label: 'Explorer', appName: 'File Explorer' };
     }
+    if (platform === 'linux') {
+      return { ...app, label: 'File Manager' };
+    }
   }
   return app;
 };
diff --git a/packages/ui/src/lib/settings/search.ts b/packages/ui/src/lib/settings/search.ts
index bc8ddb31..92d932d1 100644
--- a/packages/ui/src/lib/settings/search.ts
+++ b/packages/ui/src/lib/settings/search.ts
@@ -24,6 +24,8 @@ interface SettingsSearchAvailabilityContext extends SettingsRuntimeContext {
   isMac: boolean;
   // Windows desktop shell — for controls that only render on win32.
   isWindows: boolean;
+  // Linux desktop shell — for controls that only render on linux.
+  isLinux: boolean;
 }
 
 const SETTINGS_SEARCH_ITEMS: readonly SettingsSearchItem[] = [
@@ -385,7 +387,7 @@ const SETTINGS_SEARCH_ITEMS: readonly SettingsSearchItem[] = [
     page: 'general',
     titleKey: 'settings.openchamber.desktopNetwork.field.launchAtLogin',
     descriptionKey: 'settings.openchamber.desktopNetwork.field.launchAtLoginDescription',
-    keywords: ['desktop', 'startup', 'login'],
+    keywords: ['desktop', 'startup', 'login', 'launch', 'background', 'autostart'],
     isAvailable: (ctx) => ctx.isDesktopLocalOrigin,
   },
   {
@@ -409,8 +411,8 @@ const SETTINGS_SEARCH_ITEMS: readonly SettingsSearchItem[] = [
     page: 'general',
     titleKey: 'settings.openchamber.desktopNetwork.field.minimizeToTray',
     descriptionKey: 'settings.openchamber.desktopNetwork.field.minimizeToTrayDescription',
-    keywords: ['desktop', 'tray', 'system tray', 'minimize', 'close', 'background', 'windows'],
-    isAvailable: (ctx) => ctx.isDesktopLocalOrigin && ctx.isWindows,
+    keywords: ['desktop', 'tray', 'system tray', 'minimize', 'close', 'background', 'windows', 'linux'],
+    isAvailable: (ctx) => ctx.isDesktopLocalOrigin && (ctx.isWindows || ctx.isLinux),
   },
   {
     id: 'sessions.desktop-keep-awake',