우분투 대퍼로 업그래이드 하고 x윈도가 안뜹니다.

우분투 대퍼로 업그래이드를 했더니 x윈도가 안뜹니다.
에러메시지는 아래와 같습니다.

GDM을 시작하고나서 나온 에러입니다.
어떻게 하면 좋을까요?

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X Window System Version 6.8.2 (Ubuntu 6.8.2-77 20051010174523 root@vernadsky.buildd)
Release Date: 9 February 2005
X Protocol Version 11, Revision 0, Release 6.8.2
Build Operating System: Linux 2.6.10 i686 [ELF]
Current Operating System: Linux woorizip 2.6.12-9-386 #1 Mon Oct 10 13:14:36 BST 2005 i686
Build Date: 10 October 2005
Before reporting problems, check http://wiki.X.Org
to make sure that you have the latest version.
Module Loader present
OS Kernel: Linux version 2.6.12-9-386 (buildd@rothera) (gcc version 3.4.5 20050809 (prerelease) (Ubuntu 3.4.4-6ubuntu8)) #1 Mon Oct 10 13:14:36 BST 2005
Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Sun May 7 20:04:07 2006
(==) Using config file: "/etc/X11/xorg.conf"
Skipping "/usr/X11R6/lib/modules/extensions/libGLcore.a:m_debug_clip.o": No symbols found
Skipping "/usr/X11R6/lib/modules/extensions/libGLcore.a:m_debug_norm.o": No symbols found
Skipping "/usr/X11R6/lib/modules/extensions/libGLcore.a:m_debug_xform.o": No symbols found
(EE) Failed to load module "kbd" (module does not exist, 0)
(EE) Failed to load module "mouse" (module does not exist, 0)
Skipping "/usr/X11R6/lib/modules/libfb.a:fbmmx.o": No symbols found
(EE) No Input driver matching `kbd'
(EE) No Input driver matching `mouse'
No core keyboard

Fatal server error:
failed to initialize core devices

Please consult the The X.Org Foundation support
at http://wiki.X.Org
for help.
Please also check the log file at "/var/log/Xorg.0.log" for additional information.