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Backtrace:
[    72.861] 0: /usr/bin/X (xorg_backtrace+0x3b) [0x80e82fb]
[    72.861] 1: /usr/bin/X (0x8048000+0x5da8d) [0x80a5a8d]
[    72.861] 2: (vdso) (__kernel_rt_sigreturn+0x0) [0xa5b40c]
[    72.861] 3: /usr/lib/dri/unichrome_dri.so (0xed5000+0x164b2) [0xeeb4b2]
[    72.861] 4: /usr/lib/dri/unichrome_dri.so (0xed5000+0x1b0a8) [0xef00a8]
[    72.861] 5: /usr/lib/dri/unichrome_dri.so (0xed5000+0x16911) [0xeeb911]
[    72.861] 6: /usr/lib/dri/unichrome_dri.so (0xed5000+0xf777) [0xee4777]
[    72.861] 7: /usr/lib/xorg/modules/extensions/libglx.so (0x1de000+0x41669) [0x21f669]
[    72.861] 8: /usr/lib/xorg/modules/extensions/libglx.so (0x1de000+0x36741) [0x214741]
[    72.861] 9: /usr/lib/xorg/modules/extensions/libglx.so (0x1de000+0x3679b) [0x21479b]
[    72.861] 10: /usr/bin/X (FreeClientResources+0xed) [0x808f04d]
[    72.861] 11: /usr/bin/X (CloseDownClient+0x69) [0x8069109]
[    72.861] 12: /usr/bin/X (0x8048000+0x260a5) [0x806e0a5]
[    72.861] 13: /usr/bin/X (0x8048000+0x1a5ba) [0x80625ba]
[    72.861] 14: /lib/libc.so.6 (__libc_start_main+0xe7) [0x3d5ce7]
[    72.861] 15: /usr/bin/X (0x8048000+0x1a191) [0x8062191]
[    72.861] Segmentation fault at address 0x308
[    72.861] 
Caught signal 11 (Segmentation fault). Server aborting


Binary package hint: xorg

Loaded 10.10 from update/upgrade process (very time consuming), and Live CD.  Same symptoms.
I expected to use Ubuntu Desktop after providing a Correct Password.
Instead, after briefly seeing a desktop almost completely appear, the display re-exhibits the login screen.

I expected the Ubuntu Safe Mode to fail similarly.
Instead, It logged in but there were GUI features that were locked (User modification dialogs, delete users).

Following suggestions from https://help.ubuntu.com/community/ReportingBugs
startX indicated xserver already running...
was able to adduser, but after reboot - sudo password was disabled for added user and About Me window was first noted package that failed to open.  Other packages were fine, password using packages failed to open.

upon 10.10 reload from Live CD -
login loop occured for Ubuntu Desktop option - accepted login/password - opened Desktop - returned to login screen
recovery mode option - accepted login/password - startx - Server already active.
- ran ubuntu-bug
- noted following line in gdm log
   //Error:comand['gksu','-D','Apport','--','cat','/var/log/gdm/:log'] failed with exit code 3: Error copying '/var/run/gdm/auth-for-LOGINID-Qrtggbase'to'/tmp/libgksu-S1XlEt':Permission denied//
mention was made of backtracing - let me know if you need further information.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: xorg 1:7.5+6ubuntu3
ProcVersionSignature: Ubuntu 2.6.35-22.33-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic i686
Architecture: i386
Date: Sun Jan 23 22:16:38 2011
GdmLog: Error: command ['gksu', '-D', 'Apport', '--', 'cat', '/var/log/gdm/:0.log'] failed with exit code 3: Error copying '/var/run/gdm/auth-for-mary-Qrtggb/database' to '/tmp/libgksu-WS4Qox': Permission denied
GdmLog1: Error: command ['gksu', '-D', 'Apport', '--', 'cat', '/var/log/gdm/:0.log.1'] failed with exit code 3: Error copying '/var/run/gdm/auth-for-mary-Qrtggb/database' to '/tmp/libgksu-3JdGvi': Permission denied
GdmLog2: Error: command ['gksu', '-D', 'Apport', '--', 'cat', '/var/log/gdm/:0.log.2'] failed with exit code 3: Error copying '/var/run/gdm/auth-for-mary-Qrtggb/database' to '/tmp/libgksu-Y3KXyh': Permission denied
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
Lsusb:
 Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 002 Device 002: ID 03f0:3112 Hewlett-Packard
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: VIA Technologies, Inc. KM266A-8235
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-22-generic root=UUID=0ffebf3d-f179-4431-b49e-1c63be617fa9 ro quiet splash
ProcEnviron:
 LANG=en_CA.utf8
 SHELL=/bin/bash
SourcePackage: xorg
Symptom: display
Title: Xorg crash
dmi.bios.date: 09/16/2004
dmi.bios.vendor: Phoenix Technologies, LTD
dmi.bios.version: 6.00 PG
dmi.board.name: KM266A-8235
dmi.chassis.type: 3
dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvr6.00PG:bd09/16/2004:svnVIATechnologies,Inc.:pnKM266A-8235:pvr:rvn:rnKM266A-8235:rvr:cvn:ct3:cvr:
dmi.product.name: KM266A-8235
dmi.sys.vendor: VIA Technologies, Inc.
glxinfo: Error: [Errno 2] No such file or directory
system:
 distro:             Ubuntu
 codename:           maverick
 architecture:       i686
 kernel:             2.6.35-22-generic

** Affects: xserver-xorg-video-openchrome (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug crash i386 maverick
-- 
Xorg crash
https://bugs.launchpad.net/bugs/706783
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