Xorg crashed with SIGABRT

Hello!

I have tested Edubuntu amd64 (25452def3f96c071ab3dd417e0176788 *raring-dvd-amd64.iso 20130121), on live usb persistent.

1) Start the system;
2) On the desktop > No action > Xorg crashed.

ProblemType: Crash
DistroRelease: Ubuntu 13.04
Package: xserver-xorg-core 2:1.13.1.901-0ubuntu1
ProcVersionSignature: Ubuntu 3.8.0-1.5-generic 3.8.0-rc4
Uname: Linux 3.8.0-1-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.8-0ubuntu2
Architecture: amd64
CasperVersion: 1.330
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
Date: Mon Jan 21 09:52:58 2013
DistUpgraded: Fresh install
DistroCodename: raring
DistroVariant: ubuntu
ExecutablePath: /usr/bin/Xorg
ExtraDebuggingInterest: Yes
GraphicsCard:
 NVIDIA Corporation G92 [GeForce GTS 250] [10de:0615] (rev a2) (prog-if 00 [VGA controller])
   Subsystem: ASUSTeK Computer Inc. Device [1043:830b]
LiveMediaBuild: Edubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130121)
MachineType: System manufacturer System Product Name
MarkForUpload: True
ProcCmdline: /usr/bin/X :0 -core -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch -background none
ProcEnviron:

ProcKernelCmdLine: noprompt cdrom-detect/try-usb=true persistent file=/cdrom/preseed/hostname.seed boot=casper initrd=/casper/initrd.lz quiet splash --
Signal: 6
SourcePackage: xorg-server
StacktraceTop:
 ?? () from /lib/x86_64-linux-gnu/libc.so.6
 ?? () from /usr/lib/xorg/modules/libexa.so
 ?? () from /usr/lib/xorg/modules/libexa.so
 ?? () from /usr/lib/xorg/modules/libexa.so
 ?? () from /usr/lib/xorg/modules/libexa.so
Title: Xorg crashed with SIGABRT
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

dmi.bios.date: 12/14/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2003
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: P7P55D PRO
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2003:bd12/14/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP7P55DPRO:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
version.compiz: compiz 1:0.9.9~daily13.01.21-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.41-0ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.0.1-0ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.0.1-0ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.13.1.901-0ubuntu1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.0.0-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.20.18-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.6-0ubuntu1
xserver.bootTime: Mon Jan 21 09:58:19 2013
xserver.configfile: default
xserver.devices:
 input Power Button KEYBOARD, id 6
 input Power Button KEYBOARD, id 7
 input UVC Camera (046d:0805) KEYBOARD, id 8
 input Logitech Unifying Device. Wireless PID:1024 MOUSE, id 9
 input Logitech Unifying Device. Wireless PID:2011 KEYBOARD, id 10
xserver.errors:
 Failed to load module "nvidia" (module does not exist, 0)
 Failed to load module "nvidia" (module does not exist, 0)
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.13.1.901-0ubuntu1
xserver.video_driver: nouveau