Ubuntu
network-manager package

  1. Bug #1431774
  2. Comment #18

Comment 18 for bug 1431774

Revision history for this message
Colin Law (colin-law) wrote : Re: cifs mount hangs on shutdown - NetworkManager needs to stop after network{,-online}.target

Great, is it as simple as adding
Before=network-online.target network.target
to Unit section of /lib/systemd/system/NetworkManager.service?

Having tried it that does appear to fix the problem (including the problem with the init script in the duplicate bug, where it was timing out on a umount command).