Hm, yes i see (hierarchy 0).  I do worry that means that systems with
the unified hierarchy will be still more of a problem, since it is
mounted as hierarchy 0.  But then it's probably fine to just say that
cgroup-lite doesn't support unified hierarchy.

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https://bugs.launchpad.net/bugs/1668724

Title:
  fails to mount cgroupfs inside containers running on 16.04

Status in cgroup-lite package in Ubuntu:
  Triaged
Status in cgroup-lite source package in Precise:
  New
Status in cgroup-lite source package in Trusty:
  New
Status in cgroup-lite source package in Xenial:
  New
Status in cgroup-lite source package in Yakkety:
  New

Bug description:
  I need to run nested Ubuntu 12.04 and 14.04 containers on 16.04 hosts,
  and have noticed that the cgroups-mount script for mounting the
  cgroups inside the containers has stopped working. This is because
  systemd now comounts multiple controllers on a single hierarchy, which
  prevents mounting them individually inside the container.

  ===========  SRU Justification ================
  Impact: nested containers fail to start
  Reproduce:  create a root owned container;  install lxc and cgroup-lite;  
create a container, and try to start it.  Starting will fail if cgroup-lite is 
running in the first level container without this patch.
  Regression potential:  should be low, it's possible that the regexp is simply 
wrong for some cases.
  ===============================================

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