Hello Axel,
the OpenVZ/container maintainer went into this and fixed it with the
installation of the libpam-systemd:
apt-get install libpam-systemd
After the question from my side how he came to this conclusion, this is all I
got out of him:
"I think the cause is not easily identified now. Maybe something was changed
longer ago and that caused a change in system behavior when the system rebooted.
The other system I tried (without success) to reproduce the problem had systemd
--user sessions running. This seems to prevent the problem. I am not sure
though, so this should be tested."
Regards
Jürgen
