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[Lapogne71 <803992@xxxxxxxxxxxxxxxxxx>]

I add this problem with gnome shell. To boot again properly, I had to
log in with ALT+F1, and with apt-get, remove gdm and reinstall lightdm,
which did not cause any problem at the next reboot.

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https://bugs.launchpad.net/bugs/803992

Title:
  Natty update introduced crasher in xorg

Status in “gdm” package in Ubuntu:
  Confirmed
Status in “xorg-server” package in Ubuntu:
  Confirmed

Bug description:
  After system update around june 27, GDM (from Gnome3 PPA) will not
  start. Message "gdm-simple-slave[2306]: CRITICAL:
  gdm_session_direct_get_username: assertion `session != NULL' failed"
  appears in /var/log/syslog.

  I am able to switch console ALT-F1, and login to Gnome3 using the
  startx command.

  My /var/log/Xorg.5.log gives the error "xf86CloseConsole:
  VT_WAITACTIVE failed: Interrupted system call" short before a stack
  trace from Xorg.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: xorg 1:7.6+4ubuntu3.1
  ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
  Uname: Linux 2.6.38-8-generic i686
  NonfreeKernelModules: nvidia
  .proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0'
  .proc.driver.nvidia.gpus.1: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/1'
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86 Kernel Module  270.41.06  Mon Apr 18 14:54:25 PDT 2011
   GCC version:  gcc version 4.5.2 (Ubuntu/Linaro 4.5.2-8ubuntu4)
  Architecture: i386
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  Date: Thu Jun 30 19:01:48 2011
  DistUpgraded: Log time: 2011-05-22 11:07:13.189751
  DistroCodename: natty
  DistroVariant: ubuntu
  DkmsStatus:
   nvidia-current, 270.41.06, 2.6.38-8-generic, i686: installed 
   nvidia-173, 173.14.30, 2.6.38-8-generic, i686: installed
  GraphicsCard:
   Subsystem: nVidia Corporation Device [10de:035b]
   nVidia Corporation G71 [GeForce 7950 GX2] [10de:0294] (rev a1) (prog-if 00 [VGA controller])
     Subsystem: nVidia Corporation Device [10de:035b]
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
  JockeyStatus:
   xorg:nvidia_173 - NVIDIA accelerated graphics driver (Proprietary, Disabled, Not in use)
   xorg:nvidia_current - NVIDIA accelerated graphics driver (Proprietary, Enabled, Not in use)
  MachineType: FUJITSU SIEMENS D975XBX
  ProcEnviron:
   LANGUAGE=en_US:en
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic root=UUID=d89b1db8-2108-4a8c-b78f-9343f59a5cf7 ro quiet splash vmalloc=192M vt.handoff=7
  Renderer: Unknown
  SourcePackage: xorg
  UpgradeStatus: Upgraded to natty on 2011-05-26 (35 days ago)
  XorgConf:
   Section "Device"
   	Identifier	"Default Device"
   	Option	"NoLogo"	"True"
   EndSection
  dmi.bios.date: 09/11/2006
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: BX97510J.86A.1378.2006.0911.1542
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: D975XBX
  dmi.board.vendor: Intel Corporation
  dmi.board.version: AAD27094-305
  dmi.chassis.type: 2
  dmi.modalias: dmi:bvnIntelCorp.:bvrBX97510J.86A.1378.2006.0911.1542:bd09/11/2006:svnFUJITSUSIEMENS:pnD975XBX:pvr:rvnIntelCorporation:rnD975XBX:rvrAAD27094-305:cvn:ct2:cvr:
  dmi.product.name: D975XBX
  dmi.sys.vendor: FUJITSU SIEMENS
  version.compiz: compiz 1:0.9.4+bzr20110606-0ubuntu1~natty1
  version.libdrm2: libdrm2 2.4.23-1ubuntu6
  version.libgl1-mesa-dri: libgl1-mesa-dri 7.10.2-0ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.2-0ubuntu2
  version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
  version.xserver-xorg: xserver-xorg 1:7.6+4ubuntu3.1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu4
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-4ubuntu7.1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110107+b795ca6e-0ubuntu7

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