Looking at https://github.com/lxc/lxd/issues/4504#issuecomment-384759354, it seems that the system may not have had ubuntu-standard installed, so on do- release-upgrade the final package removal step may have listed apparmor.
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to apparmor in Ubuntu. https://bugs.launchpad.net/bugs/1767164 Title: Apparmor removed on 16.04 LTS -> 18.04 upgrade Status in apparmor package in Ubuntu: Incomplete Bug description: Apparmor is removed when upgrading a vanilla 16.04 system to 18.04 This broke my LXD. The LXD team guided me here, per https://github.com/lxc/lxd/issues/4504 Easily solved by re-installing apparmor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apparmor/+bug/1767164/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
