Lxd recover problem

[tomp (Thomas Parrott)]

The error is:

@bmullan

No such file or directory - Failed to create cgroup at_mnt 24

Sounds like:

Container startup cannot create cgroup

This was indeed the issue! My cmdline was previously systemd.unified_cgroup_hierarchy=1. Changing it to systemd.unified_cgroup_hierarchy=false as suggested smooths the transition from 5.2 to 5.3. Thanks!