Not sure the downgrade touches this file. After sudo apt install apparmor=4.0.0-beta3-0ubuntu3 libapparmor1=4.0.0-beta3-0ubuntu3 and reboot: (flatpak not working)
$ apt policy apparmor apparmor: Installed: 4.0.0-beta3-0ubuntu3 Candidate: 4.0.1-0ubuntu0.24.04.2 Version table: 4.0.1-0ubuntu0.24.04.2 500 500 http://se.archive.ubuntu.com/ubuntu noble-updates/main amd64 Packages *** 4.0.0-beta3-0ubuntu3 500 500 http://se.archive.ubuntu.com/ubuntu noble/main amd64 Packages 100 /var/lib/dpkg/status shasum /etc/apparmor.d/bwrap-userns-restrict a9bc3009905641ccaf5dfbe2c7a99b2410d05022 /etc/apparmor.d/bwrap-userns-restrict $ sudo apt install apparmor libapparmor1 ... $ shasum /etc/apparmor.d/bwrap-userns-restrict a9bc3009905641ccaf5dfbe2c7a99b2410d05022 /etc/apparmor.d/bwrap-userns-restrict $ apt policy apparmor apparmor: Installed: 4.0.1-0ubuntu0.24.04.2 Candidate: 4.0.1-0ubuntu0.24.04.2 Version table: *** 4.0.1-0ubuntu0.24.04.2 500 500 http://se.archive.ubuntu.com/ubuntu noble-updates/main amd64 Packages 100 /var/lib/dpkg/status 4.0.0-beta3-0ubuntu3 500 500 http://se.archive.ubuntu.com/ubuntu noble/main amd64 Packages $ apt-file search /etc/apparmor.d/bwrap-userns-restrict apparmor: /etc/apparmor.d/bwrap-userns-restrict Entry in /var/log/apt/history.log that seems to have broken flatpak: Start-Date: 2024-07-13 20:57:49 Commandline: aptdaemon role='role-commit-packages' sender=':1.122' Upgrade: apparmor:amd64 (4.0.0-beta3-0ubuntu3, 4.0.1-0ubuntu0.24.04.2), libapparmor1:amd64 (4.0.0-beta3-0ubuntu3, 4.0.1-0ubuntu0.24.04.2) End-Date: 2024-07-13 20:57:53 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2072811 Title: Apparmor: New update broke flatpak with `apparmor="DENIED"` To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apparmor/+bug/2072811/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs