Ubuntu 16.04 hold on boot and shutdown

[Peter Maciejko]

Tested: 361, 364 and 367.

NVIDIA bugs in journalctl:
1. Failed to query NVIDIA devices. Please ensure that the NVIDIA device files (/dev/nvidia*) exist, and that user 121 has read and write permissions for those files.
2. NMI watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [nvidia-smi:568]

$ grep 121 /etc/passwd; lsb_release -a; uname -a
nvidia-persistenced:x:121:129:NVIDIA Persistence Daemon,,,:/:/sbin/nologin
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04 LTS
Release: 16.04
Codename: xenial
Linux DTC0 4.4.0-21-generic #37-Ubuntu SMP Mon Apr 18 18:33:37 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

$ ls -ld /dev/nvidia*; file /dev/nvidia*
crw-rw-rw- 1 root root 195, 0 Jun 12 00:07 /dev/nvidia0
crw-rw-rw- 1 root root 195, 255 Jun 12 00:07 /dev/nvidiactl
crw-rw-rw- 1 root root 195, 254 Jun 12 00:07 /dev/nvidia-modeset
crw-rw-rw- 1 root root 245, 0 Jun 12 00:07 /dev/nvidia-uvm
/dev/nvidia0: character special (195/0)
/dev/nvidiactl: character special (195/255)
/dev/nvidia-modeset: character special (195/254)
/dev/nvidia-uvm: character special (245/0)

NVIDIA Bug Report in attachments. The issue disappears when nvidia drivers are uninstalled.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: nvidia-361 361.42-0ubuntu2
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: Unity
Date: Sun Jun 12 00:54:13 2016
InstallationDate: Installed on 2016-06-11 (0 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: nvidia-graphics-drivers-361
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Dustin Kirkland  (kirkland)]

This happens to me with the 367 drivers. If I downgrade, it goes away.