Attempt to sudo apt upgrade a Nested Container hangs

[bmullan (Brian Mullan)]

This was due to my Mullvad VPN install that mounted net_cls (cgroup1) over cgroup2 2

This caused LXD containers to fail to start

The solution is at the end of this thread:

HELP ! HELP ! HELP ! Cgroup2 related issue on ubuntu jammy with mullvad and PrivateInternetAccess VPN

@tomp @stgraber If you use LXD and have installed the Mullvad VPN you may find that you can no longer launch and start an LXD container. Mullvad VPN’s installation mounts “net_cls” cgroup1 over cgroup2 which is the root of the problem. To check if net_cls cgroup1 is mounted over cgroup2 run: $ mount | grep net_cls which if net_cls cgroup is shown as below: $ cgroup2 /sys/fs/cgroup cgroup2 rw,nosuid,nodev,noexec, relatime 0 0 $ net_cls /sys/fs/cgroup/net_cls cgroup rw,relatime,net_cls 0…