Enroot Apparmor error on Ubuntu Jammy

[twh]

Upgrading a test host on my cluster to 3.5 and Apparmor fails to load:
AppArmor parser error for /etc/apparmor.d/enroot in profile /etc/apparmor.d/enroot at line 1: Could not open 'abi/4.0': No such file or directory

[flx42]

We need to fix this, but for your Ubuntu version (22.04) you should be able to just disable the enroot apparmor profile:

$ sudo ln -s /etc/apparmor.d/enroot /etc/apparmor.d/disable/enroot

The apparmor profile is required for Ubuntu 23.10 and above: https://ubuntu.com/blog/ubuntu-23-10-restricted-unprivileged-user-namespaces