2016-08-05, 21:32
There's a segfault caused by nfs:// which might be part of the problem. It's hard to say though without a journalctl of the failed shutdown, and to see this you'll need to add "debugging" to your kernel parameters, then having experienced a failed shutdown restart the box and look at the previous bootlog ("journalctl -b1", I think) which may then include details of what went wrong.
