gnome-screensaver-dialog crashed with SIGSEGV in g_type_create_instance()

[iram chelli]

Binary package hint: gnome-screensaver

When i control +alt+ L i can't get back (black screen, only mouse pointer visible)
when looking in console i see that the screensaver caused a segfault
i finally have to restart x server to get out of black screen

ProblemType: Crash
Architecture: amd64
DistroRelease: Ubuntu 8.10
ExecutablePath: /usr/lib/gnome-screensaver/gnome-screensaver-dialog
Package: gnome-screensaver 2.24.0-0ubuntu2
ProcAttrCurrent: unconfined
ProcCmdline: /usr/lib/gnome-screensaver/gnome-screensaver-dialog --away-message= --enable-switch
ProcEnviron:
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/lib/gnome-screensaver/gnome-screensaver:/usr/lib/xscreensaver:/usr/lib/xscreensaver
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
Signal: 11
SourcePackage: gnome-screensaver
StacktraceTop:
 ?? () from /usr/lib/libgnomekbdui.so.3
 ?? () from /usr/lib/libgnomekbdui.so.3
 g_type_create_instance ()
 ?? () from /usr/lib/libgobject-2.0.so.0
 g_object_newv () from /usr/lib/libgobject-2.0.so.0
Title: gnome-screensaver-dialog crashed with SIGSEGV in g_type_create_instance()
Uname: Linux 2.6.27-7-generic x86_64
UserGroups: adm admin audio cdrom dialout dip floppy lpadmin netdev plugdev powerdev sambashare scanner video