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["Michael M. Rach" <michael.rach@xxxxxxxxx>]

I have 16.04LTS 64bit Desktop installed on my Dell Precision M4400
laptop which does use NVidia graphics card.  I have an Acer 4K monitor
and am running the 340 series NVidia Linux 64 driver.

This morning the system installed an update, which included the series 4
kernel.

The system boots and enters the X Windows login screen.  After
authenticating the password the system logs in and then immediately
"logs itself back out" returning to the signon screen.  This occurs for
normal user and guest accounts.

Any suggestions for a workaround?

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1525735

Title:
  X server fails to start under regular user in Xenial

Status in xorg-server package in Ubuntu:
  Confirmed

Bug description:
  The newest ISO image of Ubuntu GNOME Xenial Xerus does not launch the
  graphical installer on boot. Instead, it waits at the text-based login
  screen. I can log in using the default username of 'ubuntu-gnome' and
  start the X server with 'sudo startx.' Note that just 'startx' does
  not work; the command must be run as root. I am able to proceed with
  the installation as normal after starting X.

  After the system is fully installed, the problem persists. X can still
  be started manually after login.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xserver-xorg 1:7.7+12ubuntu1
  ProcVersionSignature: Ubuntu 4.3.0-2.11-generic 4.3.0
  Uname: Linux 4.3.0-2-generic x86_64
  ApportVersion: 2.19.3-0ubuntu2
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: GNOME
  Date: Sun Dec 13 19:43:20 2015
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroVariant: ubuntu
  GraphicsCard: InnoTek Systemberatung GmbH VirtualBox Graphics Adapter [80ee:beef] (prog-if 00 [VGA controller])
  InstallationDate: Installed on 2015-12-13 (0 days ago)
  InstallationMedia: Ubuntu-GNOME 16.04 LTS "Xenial Xerus" - Alpha amd64 (20151212)
  Lsusb:
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 002: ID 80ee:0021 VirtualBox USB Tablet
   Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: innotek GmbH VirtualBox
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.3.0-2-generic root=/dev/mapper/ubuntu--gnome--vg-root ro quiet splash
  Renderer: Software
  SourcePackage: xorg
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/01/2006
  dmi.bios.vendor: innotek GmbH
  dmi.bios.version: VirtualBox
  dmi.board.name: VirtualBox
  dmi.board.vendor: Oracle Corporation
  dmi.board.version: 1.2
  dmi.chassis.type: 1
  dmi.chassis.vendor: Oracle Corporation
  dmi.modalias: dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr:
  dmi.product.name: VirtualBox
  dmi.product.version: 1.2
  dmi.sys.vendor: innotek GmbH
  version.compiz: compiz N/A
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.65-3
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.7-1ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.7-1ubuntu1
  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+git20151019-1~exp1ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
  xserver.bootTime: Sun Dec 13 19:40:19 2015
  xserver.configfile: default
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   
  xserver.version: 2:1.17.3-2ubuntu2

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