Can you please provide a debug backtrace by following http://wiki.ubuntu.com/DebuggingProgramCrash ? This is probably a duplicate of bug 55458. Thanks.
** Changed in: gnome-system-tools (Ubuntu) Status: Unconfirmed => Needs Info -- network-admin crashes when try to open in Gnome menu https://launchpad.net/bugs/55696 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs