Oh, thanks Alex, I forgot that we have our own service for loading the
AppArmor profiles of the snaps!

Etienne, could you please show the output of

    sudo systemctl status snapd.apparmor

?

-- 
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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

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