Uploaded October 2025 | Updated September 2026, 2 weeks ago
The launch of Ubuntu 25.10 Questing Quokka brought exciting new features. For example, Canonical introduced improved platform security and new system tools written in memory-safe Rust. Unfortunately, many users installing the new operating system ran into a major problem: Flatpak stopped working entirely.
Commands:
sudo ln -s /etc/apparmor.d/fusermount3 /etc/apparmor.d/disable/
sudo apparmor_parser -R /etc/apparmor.d/fusermount3
sudo rm /etc/apparmor.d/disable/fusermount3
cat /etc/apparmor.d/fusermount3 | sudo apparmor_parser -a
What you will learn:
1. How to fix "Failed to install org.gnome.Platform: Could not unmount revokefs-fuse filesystem…" error in ubuntu 25.10
2. How to fix Warning: Could not unmount revokefs-fuse filesystem at /var/tmp/flatpak-cache-YJCAE3/org.freedesktop.Platform.GL.default-P4BAE3: Child process exited with code 1
3. How to fix Warning: Could not unmount revokefs-fuse filesystem at /var/tmp/flatpak-cache-YJCAE3/org.freedesktop.Platform.GL.default-NOSVD3: Child process exited with code 1
4. How to fix Warning: Could not unmount revokefs-fuse filesystem at /var/tmp/flatpak-cache-YJCAE3/org.freedesktop.Platform.codecs-extra-L8L3D3: Child process exited with code 1
5. How to fix Warning: Could not unmount revokefs-fuse filesystem at /var/tmp/flatpak-cache-YJCAE3/org.gnome.Platform.Locale-AKZWD3: Child process exited with code 1
6. How to fix Warning: Could not unmount revokefs-fuse filesystem at /var/tmp/flatpak-cache-YJCAE3/org.gnome.World.PikaBackup.Locale-2SC1D3: Child process exited with code 1
7. How to fix Warning: Could not unmount revokefs-fuse filesystem at /var/tmp/flatpak-cache-YJCAE3/org.gtk.Gtk3theme.Yaru-OXT0D3: Child process exited with code 1
8. How to fix error: Failed to install org.gnome.Platform: Could not unmount revokefs-fuse filesystem at /var/tmp/flatpak-cache-YJCAE3/org.gnome.Platform-AFL9D3: Child process exited with code 1
9. Temporary Solution to Fix Broken Flatpak Issue in Ubuntu 25.10
a. How to Disable the AppArmor Profile
b. How to to disable the AppArmor profile for fusermount3
c. How to Link the profile to the disable directory
d. How to Unload the profile from the kernel
10. How to make flatpak installations and updates work again
11. How to reenable the apparmor profile
12. How to fix AppArmor Conflict
#computereverywhere #Ubuntu #Ubuntu2510 #QuestingQuokka #Flatpak #Flathub #FlatpakFix #LinuxTutorial #UbuntuTips #LinuxHelp #TechGuide #OpenSource
The launch of Ubuntu 25.10 Questing Quokka brought exciting new features. For example, Canonical introduced improved platform security and new system tools written in memory-safe Rust. Unfortunately, many users installing the new operating system ran into a major problem: Flatpak stopped working entirely.
Commands:
sudo ln -s /etc/apparmor.d/fusermount3 /etc/apparmor.d/disable/
sudo apparmor_parser -R /etc/apparmor.d/fusermount3
sudo rm /etc/apparmor.d/disable/fusermount3
cat /etc/apparmor.d/fusermount3 | sudo apparmor_parser -a
What you will learn:
1. How to fix "Failed to install org.gnome.Platform: Could not unmount revokefs-fuse filesystem…" error in ubuntu 25.10
2. How to fix Warning: Could not unmount revokefs-fuse filesystem at /var/tmp/flatpak-cache-YJCAE3/org.freedesktop.Platform.GL.default-P4BAE3: Child process exited with code 1
3. How to fix Warning: Could not unmount revokefs-fuse filesystem at /var/tmp/flatpak-cache-YJCAE3/org.freedesktop.Platform.GL.default-NOSVD3: Child process exited with code 1
4. How to fix Warning: Could not unmount revokefs-fuse filesystem at /var/tmp/flatpak-cache-YJCAE3/org.freedesktop.Platform.codecs-extra-L8L3D3: Child process exited with code 1
5. How to fix Warning: Could not unmount revokefs-fuse filesystem at /var/tmp/flatpak-cache-YJCAE3/org.gnome.Platform.Locale-AKZWD3: Child process exited with code 1
6. How to fix Warning: Could not unmount revokefs-fuse filesystem at /var/tmp/flatpak-cache-YJCAE3/org.gnome.World.PikaBackup.Locale-2SC1D3: Child process exited with code 1
7. How to fix Warning: Could not unmount revokefs-fuse filesystem at /var/tmp/flatpak-cache-YJCAE3/org.gtk.Gtk3theme.Yaru-OXT0D3: Child process exited with code 1
8. How to fix error: Failed to install org.gnome.Platform: Could not unmount revokefs-fuse filesystem at /var/tmp/flatpak-cache-YJCAE3/org.gnome.Platform-AFL9D3: Child process exited with code 1
9. Temporary Solution to Fix Broken Flatpak Issue in Ubuntu 25.10
a. How to Disable the AppArmor Profile
b. How to to disable the AppArmor profile for fusermount3
c. How to Link the profile to the disable directory
d. How to Unload the profile from the kernel
10. How to make flatpak installations and updates work again
11. How to reenable the apparmor profile
12. How to fix AppArmor Conflict
#computereverywhere #Ubuntu #Ubuntu2510 #QuestingQuokka #Flatpak #Flathub #FlatpakFix #LinuxTutorial #UbuntuTips #LinuxHelp #TechGuide #OpenSource
