Public bug reported:

~ $ lsb_release -rd
Description:    Ubuntu 16.04 LTS
Release:        16.04
~ $ apt-cache policy nvidia-361 xorg
nvidia-361:
  Installed: 361.42-0ubuntu2
  Candidate: 361.42-0ubuntu2
  Version table:
 *** 361.42-0ubuntu2 500
        500 http://mirror.internode.on.net/pub/ubuntu/ubuntu xenial/restricted 
amd64 Packages
        100 /var/lib/dpkg/status
xorg:
  Installed: 1:7.7+13ubuntu3
  Candidate: 1:7.7+13ubuntu3
  Version table:
 *** 1:7.7+13ubuntu3 500
        500 http://mirror.internode.on.net/pub/ubuntu/ubuntu xenial/main amd64 
Packages
        100 /var/lib/dpkg/status


Boot machine and login with correct credentials.

Expect a functioning X session with gnome.

Instead immediately returned to greeter.

Attempted to do backtracing, but this did not work because (presumably)
of absence of ../sysdeps/unix/syscall-template.S and an error returned
after staring gdb, `"/usr/bin/Xorg": not in executable format: File
format not recognised'. Went ahead any way and gdb sees:

```
<snip>
Reading symbols from /usr/lib/xorg/modules/input/evdev_drv.so...(no debugging 
symbols found)...done.
Reading symbols from /usr/lib/x86_64-linux-gnu/libmtdev.so.1...(no debugging 
symbols found)...done.
Reading symbols from /usr/lib/x86_64-linux-gnu/libevdev.so.2...(no debugging 
symbols found)...done.
Reading symbols from /usr/lib/xorg/modules/input/synaptics_drv.so...(no 
debugging symbols found)...done.
0x00007fe59028acf3 in __select_nocancel ()
    at ../sysdeps/unix/syscall-template.S:84
84      ../sysdeps/unix/syscall-template.S: No such file or directory.
(gdb) cont
Continuing.
warning: Corrupted shared library list: 0x556edfb384d0 != 0x556edfba4c60
warning: Corrupted shared library list: 0x556edfbc48c0 != 0x556edfb384d0

Program received signal SIGTERM, Terminated.
0x00007fe59028acf3 in __select_nocancel ()
    at ../sysdeps/unix/syscall-template.S:84
84      in ../sysdeps/unix/syscall-template.S
(gdb) cont
Continuing.

Program terminated with signal SIGKILL, Killed.
The program no longer exists.
```

If given instructions on how to get backtracking to work, will happily
reattempt.

Using nvidia-304 (current) is worse, crashing in the greeter. Nouveau is
unusable due to lag and sluggishness.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-24.43-generic 4.4.10
Uname: Linux 4.4.0-24-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
.proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0000:01:00.0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  361.42  Tue Mar 22 18:10:58 
PDT 2016
 GCC version:  gcc version 5.3.1 20160413 (Ubuntu 5.3.1-14ubuntu2.1)
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
Date: Sat Jun 11 17:46:17 2016
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 Intel Corporation Skylake Integrated Graphics [8086:191b] (rev 06) (prog-if 00 
[VGA controller])
   Subsystem: CLEVO/KAPOK Computer Skylake Integrated Graphics [1558:6540]
 NVIDIA Corporation GM204M [GeForce GTX 970M] [10de:13d8] (rev a1) (prog-if 00 
[VGA controller])
   Subsystem: CLEVO/KAPOK Computer GM204M [GeForce GTX 970M] [1558:6540]
InstallationDate: Installed on 2016-06-07 (3 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 004: ID 5986:066d Acer, Inc 
 Bus 001 Device 003: ID 0cf3:e300 Atheros Communications, Inc. 
 Bus 001 Device 002: ID 1c7a:0603 LighTuning Technology Inc. 
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Notebook P65_P67RGRERA
ProcEnviron:
 LANGUAGE=en_AU:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_AU.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-24-generic 
root=UUID=153d01ca-6817-4bd1-9ace-8a3a44586e7a ro nomodeset quiet splash
SourcePackage: xorg
Symptom: display
Title: Xorg crash
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/27/2016
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1.05.13
dmi.board.asset.tag: Tag 12345
dmi.board.name: P65_P67RGRERA
dmi.board.vendor: Notebook
dmi.board.version: Not Applicable
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Notebook
dmi.chassis.version: N/A
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr1.05.13:bd01/27/2016:svnNotebook:pnP65_P67RGRERA:pvrNotApplicable:rvnNotebook:rnP65_P67RGRERA:rvrNotApplicable:cvnNotebook:ct10:cvrN/A:
dmi.product.name: P65_P67RGRERA
dmi.product.version: Not Applicable
dmi.sys.vendor: Notebook
version.compiz: compiz 1:0.9.12.2+16.04.20160526-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.67-1ubuntu0.16.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2.2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160325-1ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2
xserver.bootTime: Sat Jun 11 17:45:04 2016
xserver.configfile: default
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.18.3-1ubuntu2.2

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug crash ubuntu xenial

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https://bugs.launchpad.net/bugs/1591472

Title:
  Xorg crashes immediately on login returning to greeter

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