gnome-screensaver-gl-helper crashed with SIGSEGV in __driCreateNewScreen_20050727()

Binary package hint: gnome-screensaver

I upgrade my ubuntu form version 10.10 to 11.04 64 bits and when I reestart to end the upgrade the system show this message

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: gnome-screensaver 2.30.2-0ubuntu2
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
NonfreeKernelModules: fglrx
Architecture: amd64
Date: Fri Apr 15 21:54:19 2011
ExecutablePath: /usr/lib/gnome-screensaver/gnome-screensaver-gl-helper
GconfGnomeSession:
 idle_delay = 5
  /desktop/gnome/session/required_components:
   windowmanager = gnome-wm
GnomeSessionIdleInhibited: No
GnomeSessionInhibitors: None
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
ProcCmdline: /usr/lib/gnome-screensaver/gnome-screensaver-gl-helper
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, no user)
 LANGUAGE=pt_BR:pt:en
 LANG=pt_BR.utf8
SegvAnalysis:
 Segfault happened at: 0x7f0c0f03a356: mov 0xc(%rax),%eax
 PC (0x7f0c0f03a356) ok
 source "0xc(%rax)" (0x0000000c) not located in a known VMA region (needed readable region)!
 destination "%eax" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: gnome-screensaver
StacktraceTop:
 ?? () from /usr/lib/fglrx/dri/fglrx_dri.so
 ?? () from /usr/lib/fglrx/dri/fglrx_dri.so
 __driCreateNewScreen_20050727 () from /usr/lib/fglrx/dri/fglrx_dri.so
 ?? () from /usr/lib/fglrx/libGL.so.1
 ?? () from /usr/lib/fglrx/libGL.so.1
Title: gnome-screensaver-gl-helper crashed with SIGSEGV in __driCreateNewScreen_20050727()
UpgradeStatus: Upgraded to natty on 2011-04-16 (0 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
WindowManager: gnome-wm