I think my previous two comments really have nothing to do with the actual problem. Me just grasping at straws trying to find some kind of information. The following patch is a hack and not anywhere close to a solution but does make the /etc/init.d/networking script complete during shutdown.
** Patch added: "networking.patch" http://launchpadlibrarian.net/46522420/networking.patch -- dhclient3 hangs on shutdown https://bugs.launchpad.net/bugs/571933 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs