Please, issue an update for 12.10 quantal (network-manager 0.9.6.0-0ubuntu7) Due to this bug root filesystem can not be cleanly unmounted on shutdown.
Upstart launch NetworkManager as a daemon. If a system-wide network connection is established, dhclient and dnsmasqd open files for writing in /var directory. During shutdown upstart sends SIGTERM to NetworkManager, but the signal is blocked. 5 seconds later NetworkManager is killed (SIGKILL) by upstart, but dhclient and dnsmasq are alive. Also the directory /var/run/sendsigs.omit.d/ contains the following files network-manager.dhclient-eth0.pid network-manager.dnsmasq.pid At the very end /etc/init.d/umountroot can not unmount / filesystem due to files open for writing by dhclient in /var/lib/dhcp mount: / is busy Message appears before poweroff. To make it apparent use sudo halt command. There are a bunch of bugs (e.g. #1061639, #1073433, etc) sometimes with mistereous comments and workarounds. They can be connected with this issue. I suppose that filestem recovery on every boot is strong reason for package update in quantal -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1124803 Title: NetworkManager doesn't respond to SIGTERM in daemon mode To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1124803/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
