This was reported to the upstream https://github.com/lxc/lxc/issues/3198
The purpose of libpam-cgfs is only chowning some CGroup directories to the
login user.
When Linux is booted with systemd.unified_cgroup_hierarchy,
/sys/fs/cgroup/user.slice/user-$UID.slice/session-nnn.scope is not chowned to a
login user.
So libpam-cgfs completely fails to function under cgroup v2.
** Also affects: lxcfs (Ubuntu)
Importance: Undecided
Status: New
** Bug watch added: LXC bug tracker #3198
https://github.com/lxc/lxc/issues/3198
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https://bugs.launchpad.net/bugs/1850667
Title:
cgroup v2 is not fully supported yet, proceeding with partial
confinement
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