kwin crashes on login.....

[emmanuel henry]

Binary package hint: kdebase-workspace

When kubuntu starts....I've got a message

ProblemType: Crash
Architecture: i386
CrashCounter: 1
Date: Fri Oct 30 09:53:23 2009
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/bin/kwin
NonfreeKernelModules: nvidia
Package: kde-window-manager 4:4.3.2-0ubuntu7
ProcCmdline: kwin -session 101741bd1a313d000124021926300000061480021_1256885155_784229
ProcEnviron:
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
 LANGUAGE=
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
SegvAnalysis:
 Segfault happened at: 0x644422 <__kernel_vsyscall+2>: ret
 PC (0x00644422) ok
 Reason could not be automatically determined.
Signal: 11
SourcePackage: kdebase-workspace
Stacktrace:
 #0 0x00644422 in __kernel_vsyscall ()
 No symbol table info available.
 Cannot access memory at address 0xbfd4b07c
StacktraceTop: __kernel_vsyscall ()
ThreadStacktrace:
 .
 Thread 1 (Thread 2739):
 #0 0x00644422 in __kernel_vsyscall ()
 No symbol table info available.
 Cannot access memory at address 0xbfd4b07c
Title: kwin crashed with SIGSEGV in __kernel_vsyscall()
Uname: Linux 2.6.31-14-generic i686
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare www-data
XsessionErrors: (polkit-gnome-authentication-agent-1:4420): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make Ubuntu better. This particular crash has already been reported and is a duplicate of bug #479656, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.