I have the same exact problem and it's an NM bug as pointed out by Thomas. This is closed related to https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/632896.
A new proposed network-manager package has just been uploaded to fix the problem. It works for me, so far. -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to rabbitmq-server in ubuntu. https://bugs.launchpad.net/bugs/670289 Title: Laptop won't shut down with rabbitmq running -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
