I installed elementary OS 6, done a few things on it including installing Firefox from FlatHub. Then I restarted the PC and tried to launch the AppCenter again. However, this didn't do anything. Trying to run it from the Terminal, I get:

$ io.elementary.appcenter
Failed to register: Timeout was reached

Nonetheless, running --help does finish:

$ io.elementary.appcenter --help

  io.elementary.appcenter [OPTION?]

Help Options:
  -h, --help                              Show help options
  --help-all                              Show all help options
  --help-gapplication                     Show GApplication options
  --help-gtk                              Show GTK+ Options

Application Options:
  -u, --show-updates                      Display the Installed Panel
  -s, --silent                            Run the Application in background
  -l, --load-local=FILENAME               Add a local AppStream XML file to the package list
  -f, --fake-package-update=PACKAGES?     Add the package name to update results so that it is shown as an update
  --display=DISPLAY                       X display to use
  • A reboot fixed the issue.
    – m93a
    Oct 2, 2021 at 11:39

1 Answer 1


use sudo io.elementary.appcenter

  • 1
    That sounds like a fairly terrible idea. You should never randomly throw sudo at GUI applications when they don't work.
    – m93a
    Sep 26, 2021 at 16:41

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.