Public bug reported:

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

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


** Tags: apport-bug i386 natty regression-update ubuntu

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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/803992

Title:
  Natty update introduced crasher in xorg

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