I have exactly the same problem on Ubuntu Feisty. I my case, also I get messages during shutdown complaining about CIFS command timeouts (CIFS shares are mounted on bootup from /etc/fstab).
I can also confirm that after removing the network-manager package the problem completely disappears. -- Unmount of remote CIFS shares fails with timeout on system shutdown https://launchpad.net/bugs/90795 -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
