Thanks Etienne, this is a bit surprising! Do I understand correctly, that on the slower machine (where you are seeing this bug) you will not be able to start firefox until you have run that apparmor_parser command? Not even if you try starting firefox well after the login?
It's strange, because your logs show that the apparmor.service unit was started can you please also attach the output of these commands: sudo systemctl status apparmor sudo journalctl -b _SYSTEMD_UNIT=apparmor.service + SYSLOG_IDENTIFIER=audit And then also this (make sure you haven't previously started firefox in this boot): SNAPD_DEBUG=1 firefox And after that, let's have a look at the full system log (I have no clear idea what to look for, actually, but maybe I'll spot something suspicious): sudo journalctl -b -- 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/1871148 Title: services start before apparmor profiles are loaded Status in AppArmor: Invalid Status in snapd: Fix Released Status in apparmor package in Ubuntu: Fix Released Status in snapd package in Ubuntu: Fix Released Status in zsys package in Ubuntu: Invalid Status in apparmor source package in Focal: Fix Released Status in snapd source package in Focal: Fix Released Status in zsys source package in Focal: Invalid Bug description: Per discussion with Zyga in #snapd on Freenode, I have hit a race condition where services are being started by the system before apparmor has been started. I have a complete log of my system showing the effect somewhere within at https://paste.ubuntu.com/p/Jyx6gfFc3q/. Restarting apparmor using `sudo systemctl restart apparmor` is enough to bring installed snaps back to full functionality. Previously, when running any snap I would receive the following in the terminal: --- cannot change profile for the next exec call: No such file or directory snap-update-ns failed with code 1: File exists --- Updated to add for Jamie: $ snap version snap 2.44.2+20.04 snapd 2.44.2+20.04 series 16 ubuntu 20.04 kernel 5.4.0-21-generic To manage notifications about this bug go to: https://bugs.launchpad.net/apparmor/+bug/1871148/+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