Bug#787758: 'Failed at step NAMESPACE spawning' when using ReadOnlyDirectories in multi-instance service file

[nusenu]

> Do you maybe have anything installed on your upgraded system which might
> interfere with systemd, like cgmanager, lxc, cgroup-bin etc.

upgraded-system#  dpkg -l cgmanager lxc cgroup-bin
dpkg-query: no packages found matching cgmanager
dpkg-query: no packages found matching lxc
dpkg-query: no packages found matching cgroup-bin