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[Fabio <1543745@xxxxxxxxxxxxxxxxxx>]

I can also log in to Unity purging all the nvidia drivers. Note that my
laptop uses nvidia optimus, which caused some headaches even in the
past, so it could be related to that. Let me know what else to test or
ask me any other information that could be useful.

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https://bugs.launchpad.net/bugs/1543745

Title:
  Xorg crash prevents login

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  After a recent update, it's no more possible to log in to Ubuntu 16.04
  trough lightdm with Unity.

  I'm attaching .xsession-errors hoping it can be useful.

  *******************************************
  Workaround:
  remove all the nvidia drivers. 
  You won't have graphics accelerated but at 
  least you can log in on Unity.

  sudo apt purge nvidia*

  *******************************************

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu1
  ProcVersionSignature: Ubuntu 4.3.0-7.18-generic 4.3.3
  Uname: Linux 4.3.0-7-generic x86_64
  .tmp.unity.support.test.0:

  ApportVersion: 2.19.4-0ubuntu2
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Tue Feb  9 20:11:26 2016
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroVariant: ubuntu
  DkmsStatus:
   bbswitch, 0.8, 4.3.0-5-generic, x86_64: installed
   bbswitch, 0.8, 4.3.0-7-generic, x86_64: installed
   bbswitch, 0.8, 4.4.0-2-generic, x86_64: installed
   psmouse-focaltech, 0.1, 3.19.0-18-generic, x86_64: installed
   psmouse-focaltech, 0.1, 3.19.0-20-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation 4th Gen Core Processor Integrated Graphics Controller [8086:0416] (rev 06) (prog-if 00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. 4th Gen Core Processor Integrated Graphics Controller [1043:178d]
  InstallationDate: Installed on 2015-03-21 (325 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20150321)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 0bda:57b4 Realtek Semiconductor Corp.
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: ASUSTeK COMPUTER INC. X550JK
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.3.0-7-generic.efi.signed root=UUID=3eab3ace-7b67-4e6a-aea7-d31b73cc4819 ro quiet splash acpi_osi=
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/08/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: X550JK.303
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: X550JK
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrX550JK.303:bd10/08/2014:svnASUSTeKCOMPUTERINC.:pnX550JK:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX550JK:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.name: X550JK
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.
  version.compiz: compiz 1:0.9.12.2+16.04.20151211-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.66-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.1.1-1ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.1.1-1ubuntu2
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.3-2ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.6.1-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20160127-1ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1
  xserver.bootTime: Tue Feb  9 19:54:16 2016
  xserver.configfile: default
  xserver.errors: systemd-logind: failed to get session: PID 926 does not belong to any known session
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                1117
   vendor                                     LGD
  xserver.version: 2:1.17.3-2ubuntu2
  ---
  ApportVersion: 2.19.4-0ubuntu2
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: XFCE
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroRelease: Ubuntu 16.04
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation 4th Gen Core Processor Integrated Graphics Controller [8086:0416] (rev 06) (prog-if 00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. 4th Gen Core Processor Integrated Graphics Controller [1043:178d]
  InstallationDate: Installed on 2015-03-21 (330 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20150321)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 0bda:57b4 Realtek Semiconductor Corp.
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: ASUSTeK COMPUTER INC. X550JK
  Package: xorg 1:7.7+13ubuntu1
  PackageArchitecture: amd64
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-4-generic.efi.signed root=UUID=3eab3ace-7b67-4e6a-aea7-d31b73cc4819 ro quiet splash
  ProcVersionSignature: Ubuntu 4.4.0-4.19-generic 4.4.1
  Tags:  xenial ubuntu reproducible has-workaround
  Uname: Linux 4.4.0-4-generic x86_64
  UnitySupportTest:
   Error: command [u'/usr/lib/nux/unity_support_test', u'-p', u'-f'] failed with exit code 5: Xlib:  extension "GLX" missing on display ":0".
   Xlib:  extension "GLX" missing on display ":0".
   Error: GLX is not available on the system
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm bumblebee cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 10/08/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: X550JK.303
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: X550JK
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrX550JK.303:bd10/08/2014:svnASUSTeKCOMPUTERINC.:pnX550JK:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX550JK:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.name: X550JK
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.
  version.compiz: compiz 1:0.9.12.2+16.04.20160209-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.66-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.1.1-1ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.1.1-1ubuntu2
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.3-2ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.6.1-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20160127-1ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1
  xserver.bootTime: Sun Feb 14 20:43:40 2016
  xserver.configfile: default
  xserver.errors:
   systemd-logind: failed to get session: PID 2319 does not belong to any known session
   Failed to initialize GLX extension (Compatible NVIDIA X driver not found)
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                1117
   vendor                                     LGD
  xserver.version: 2:1.17.3-2ubuntu2

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