Comment 0 for bug 1169614

The result is
"mount: / is busy"
and root filesystem recovery during next boot.

network-manager 0.9.8.0-0ubuntu3 in Raring
neither stop dhclient in response to
"stop network-manager" nor remove pid file
from /run/sendsigs.omit.d/
So dhclient skipped by /etc/init.d/sendsigs
and a lease file is open for writing in
/var/lib/NetworkManager
while /etc/init.d/umountroot is running.
As a consequence root filesystem can not
be cleanly remount readonly before poweroff.

In default setup the problem is hidden by
plymouth. The problem does not appear
if network is disabled or the cable is unplugged
before shutdown.

There are some other bugs that might be caused
by this issue, but they are flooded with comments
that have no direct relations to this bug.