The initial report indicated a parser error, but then it was reported that the apparmor package was removed, so then it would not be able to run properly. I'm not able to reproduce with the information given. If you are able to provide exact steps to reproduce, please do and we can take another look.
** Changed in: snapd (Ubuntu) Status: New => Invalid ** Changed in: apparmor (Ubuntu) Status: New => Incomplete -- 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/1764312 Title: fails to start in Bionic Status in apparmor package in Ubuntu: Incomplete Status in snapd package in Ubuntu: Invalid Bug description: $ systemctl status apparmor ● apparmor.service - AppArmor initialization Loaded: loaded (/lib/systemd/system/apparmor.service; enabled; vendor preset: enabled) Active: failed (Result: exit-code) since Mon 2018-04-16 07:46:13 BST; 1h 10min ago Docs: man:apparmor(7) http://wiki.apparmor.net/ Process: 635 ExecStart=/etc/init.d/apparmor start (code=exited, status=123) Main PID: 635 (code=exited, status=123) Apr 16 07:46:12 ev34 apparmor[635]: Skipping profile in /etc/apparmor.d/disable: usr.bin.firefox Apr 16 07:46:12 ev34 apparmor[635]: AppArmor parser error for /etc/apparmor.d/usr.lib.snapd.snap-confine.real in /etc/ap Apr 16 07:46:13 ev34 apparmor[635]: Skipping profile in /etc/apparmor.d/disable: usr.sbin.rsyslogd Apr 16 07:46:13 ev34 apparmor[635]: Skipping profile in /etc/apparmor.d/disable: usr.bin.firefox Apr 16 07:46:13 ev34 apparmor[635]: AppArmor parser error for /etc/apparmor.d/usr.lib.snapd.snap-confine.real in /etc/ap Apr 16 07:46:13 ev34 apparmor[635]: Skipping profile in /etc/apparmor.d/disable: usr.sbin.rsyslogd Apr 16 07:46:13 ev34 apparmor[635]: ...fail! Apr 16 07:46:13 ev34 systemd[1]: apparmor.service: Main process exited, code=exited, status=123/n/a Apr 16 07:46:13 ev34 systemd[1]: apparmor.service: Failed with result 'exit-code'. Apr 16 07:46:13 ev34 systemd[1]: Failed to start AppArmor initialization. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apparmor/+bug/1764312/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp