Bug#943981: Proposal: Switch to cgroupv2 by default

[Ryutaroh Matsumoto]

Hi Michael,

I filed two unwelcome interactions between systemd and LXC on Debian:

(1) lxc: jessie LXC container does not start on hosts with cgroup2 / unified hierarchy
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=958507

(2) lxc: autopkgtest of systemd in stretch fails with LXC backend in cgroup2 / unified hierarchy
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=958508

The latter might deserve your attention...
As Debian Stretch has not yet reached to its end of life...

Best regards, Ryutaroh