Can't umount /var/lib/vz/root/100: Device or resource busy - solution Shutdown then umount (which appears in the same menu)
df -h (to see what's mounted)
runlevel unknown - solution : in virt1, vzctl enter 104, puis telinit 2
Proxmox 4 : https://help.ubuntu.com/lts/serverguide/lxc.html
ALSO NEED TO TRY : https://bugs.launchpad.net/ubuntu/+source/upstart/+bug/543506/comments/81
For many of us, the solution is already in this Bug report. Namely:
From comment #54
Comment out “console output” in all /etc/init/*.conf files that have it.
From comment #73
Add “started rsyslog” to the “start on” stanza in /etc/init/rc-sysinit.conf:
start on ( filesystem
and started rsyslog
and net-device-up IFACE=lo
From comment #79
Add “init='/sbin/init –verbose'” to the linux boot line in grub.
Folks: Have any of you found this insufficient? Was there anything else you had to do to achieve reliable boots?