For the recent security fix LightDM has to drop privileges to write the authority file, but I guess it could be set wrong. Alex. Could you log into a text terminal and check the permissions on ~/.Xauthority. If they're wrong fix them/delete the file then login again and see if this fixes the problem.
** Changed in: lightdm (Ubuntu) Status: New => Fix Committed ** Changed in: lightdm (Ubuntu) Importance: Undecided => Medium ** Summary changed: - Xorg crash + Failing to write ~/.Xauthority ** Changed in: lightdm (Ubuntu) Status: Fix Committed => Triaged -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to lightdm in Ubuntu. https://bugs.launchpad.net/bugs/855773 Title: Failing to write ~/.Xauthority Status in “lightdm” package in Ubuntu: Triaged Bug description: After a dist-upgrade today on oneiric, i am not able to open a desktop sesion. After loging in through lightdm, screen changes to console and then goes back to login screen. I am not able to see any error in system logs. ProblemType: Bug DistroRelease: Ubuntu 11.10 Package: xorg 1:7.6+7ubuntu7 ProcVersionSignature: Ubuntu 3.0.0-11.18-generic 3.0.4 Uname: Linux 3.0.0-11-generic x86_64 ApportVersion: 1.23-0ubuntu1 Architecture: amd64 CompizPlugins: [core,bailer,detection,composite,opengl,decor,vpswitch,grid,gnomecompat,move,regex,imgpng,resize,unitymtgrabhandles,snap,animation,place,workarounds,compiztoolbox,mousepoll,expo,session,wall,ezoom,fade,scale,unityshell] Date: Wed Sep 21 19:51:10 2011 DistUpgraded: Fresh install DistroCodename: oneiric DistroVariant: ubuntu DkmsStatus: virtualbox, 4.1.2, 3.0.0-10-generic, x86_64: installed virtualbox, 4.1.2, 3.0.0-11-generic, x86_64: installed ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu GraphicsCard: Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] (rev 18) (prog-if 00 [VGA controller]) Subsystem: ASUSTeK Computer Inc. Device [1043:1332] nVidia Corporation GT218 [GeForce 310M] [10de:0a72] (rev a2) (prog-if 00 [VGA controller]) Subsystem: ASUSTeK Computer Inc. Device [1043:1332] InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110902) MachineType: ASUSTeK Computer Inc. U30Jc ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-11-generic root=UUID=dc6655f9-fecd-4af6-ac18-6bf0c813711f ro SourcePackage: xorg Symptom: display Title: Xorg crash UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 01/24/2011 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: U30Jc.217 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: U30Jc dmi.board.vendor: ASUSTeK Computer Inc. dmi.board.version: 1.0 dmi.chassis.asset.tag: ATN12345678901234567 dmi.chassis.type: 10 dmi.chassis.vendor: ASUSTeK Computer Inc. dmi.chassis.version: 1.0 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrU30Jc.217:bd01/24/2011:svnASUSTeKComputerInc.:pnU30Jc:pvr1.0:rvnASUSTeKComputerInc.:rnU30Jc:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0: dmi.product.name: U30Jc dmi.product.version: 1.0 dmi.sys.vendor: ASUSTeK Computer Inc. version.compiz: compiz 1:0.9.5.94+bzr2803-0ubuntu5 version.ia32-libs: ia32-libs 20090808ubuntu22 version.libdrm2: libdrm2 2.4.26-1ubuntu1 version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu3 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu3 version.xserver-xorg: xserver-xorg 1:7.6+7ubuntu7 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20110811.g93fc084-0ubuntu1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.901-1ubuntu2 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110411+8378443-1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/855773/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp