#troubleshooting

Make macOS pick the right input source for whichever keyboard you actually type on — French (Mac) for the built-in and Apple keyboards, French-PC for a Keychron V6 Max — using two Karabiner-Elements rules, plus the two traps that silently break it: keyboards that also declare themselves as pointing devices, and the console user server not restarting after a Karabiner update.

Extension Manager (and every other Flatpak app) hangs forever at launch with unkillable processes. The cause is not the app: it is the Keybase redirector's dead FUSE mount on /keybase, which Flatpak stats while building its sandbox. How to identify it, unblock it without rebooting, and remove Keybase for good.

Google Chrome silently fails to launch after a hostname change. The cause is a stale SingletonLock symlink in the user profile that still encodes the old machine name; deleting the Singleton* lock files restores normal startup. Applies to every Chromium-based browser and Electron app.