users-admin crashed with signal 5 in g_option_context_parse()

[Pixel]

crash on start application "users & groups"

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: gnome-system-tools 2.32.0-0ubuntu7
ProcVersionSignature: Ubuntu 3.0.0-8.10-generic 3.0.1
Uname: Linux 3.0.0-8-generic i686
Architecture: i386
Date: Sat Aug 13 11:21:51 2011
ExecutablePath: /usr/bin/users-admin
InstallationMedia: Xubuntu 11.04 "Natty Narwhal" - Release i386 (20110427)
ProcCmdline: users-admin
ProcEnviron:
 PATH=(custom, no user)
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
Signal: 5
SourcePackage: gnome-system-tools
StacktraceTop:
 ?? () from /usr/lib/i386-linux-gnu/libgtk-x11-2.0.so.0
 g_option_context_parse () from /lib/i386-linux-gnu/libglib-2.0.so.0
 gtk_parse_args () from /usr/lib/i386-linux-gnu/libgtk-x11-2.0.so.0
 gtk_init_check () from /usr/lib/i386-linux-gnu/libgtk-x11-2.0.so.0
 gtk_init () from /usr/lib/i386-linux-gnu/libgtk-x11-2.0.so.0
Title: users-admin crashed with signal 5 in g_option_context_parse()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare