Ubuntu 25.10 Flatpak issue fix is on the way!
Ubuntu 25.10 Questing Quokka was released a week ago, and it brought many new exciting features. Sadly, it appears that it has broken Flatpak support, as users were encountering errors when trying to install any Flatpak application, and bug reports, such as this one, were being landed to Launchpad.
When Ubuntu 25.10 Questing Quokka was released, users have discovered that the installation of any Flatpak application fails with error messages stating that itâs unable to unmount revokefs-fuse, which is a fatal bug. Additionally, AppArmor generates messages that talk about permission denial of file accesses in /run/mount/utab and its related files, which are /run/mount/utab.*.
The error messages that are generated when trying to install any Flatpak application are:
Warning: Could not unmount revokefs-fuse filesystem at /var/tmp/flatpak-cache-4EB3B3/org.freedesktop.Platform.GL.default-FAB3B3: Child process exited with code 1Warning: Could not unmount revokefs-fuse filesystem at /var/tmp/flatpak-cache-4EB3B3/org.freedesktop.Platform.GL.default-K8HAC3: Child process exited with code 1Warning: Could not unmount revokefs-fuse filesystem at /var/tmp/flatpak-cache-4EB3B3/org.freedesktop.Platform.openh264-D0P4B3: Child process exited with code 1Warning: Could not unmount revokefs-fuse filesystem at /var/tmp/flatpak-cache-4EB3B3/org.gnome.Platform.Locale-QP83B3: Child process exited with code 1Warning: Could not unmount revokefs-fuse filesystem at /var/tmp/flatpak-cache-4EB3B3/org.gtk.Gtk3theme.Yaru-dark-M2N7B3: Child process exited with code 1error: Failed to install org.gnome.Platform: Could not unmount revokefs-fuse filesystem at /var/tmp/flatpak-cache-4EB3B3/org.gnome.Platform-EM6KC3: Child process exited with code 1
The bug will be fixed soon, but the fix has landed to the -proposed repository pocket with version 5.0.0~alpha1-0ubuntu8.1 of apparmor. Before, the version that came with the release was 5.0.0~alpha1-0ubuntu8.
When this fixed version was installed, people began verifying that the fix actually worked, and it looks like that the fix worked, as Flatpak installations seemed to have succeeded, and that the resulting applications were running fine. However, AppArmor still generates denial messages related to DAC_OVERRIDE and SETUID capabilities.
If the fix lands, youâll be able to install and run Flatpak applications on your system.
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