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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

Usage:
  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
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  • A reboot fixed the issue.
    – m93a
    Oct 2 at 11:39
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use sudo io.elementary.appcenter

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  • 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 at 16:41

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