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Quadrant ID on Linux has been fixed.
Soon a new version of Quadrant will be available on Quadrant, with this version Linux users will finally be able to use Quadrant ID without any hassle. The issue was that the app couldn't talk to libsecrets, that was the reason why Quadrant ID related features wouldn't work on Flatpak. If you didn't update yet or don't want to update to the refresh of v24.6.2, you can let the older versions of the app to communicate with libsecrets by typing in this command: flatpak override --talk-name=org.freedesktop.secrets dev.mrquantumoff.mcmodpackmanager --user