I'am effected by the same bug and here is a analysis made by someone else: http://askubuntu.com/questions/878630/apt-unattended-upgrades-stalls-shutdown
The suggested patch works well. I hope it won't take too long to merge it. ** Tags added: xenial -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1661611 Title: apt/unattended-upgrades stalls shutdown To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/unattended-upgrades/+bug/1661611/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs