Unfortunately, I'm not able to reproduce this crash. If you still can, please generate another backtrace with libglib2.0-0-dbg and libgtk2.0-0-dbg installed. Using a debug build of gnome-nettool would also be helpful (information at http://wiki.ubuntu.com/DebuggingProgramCrash).
Thanks for your bug report.
Unfortunately, I'm not able to reproduce this crash. If you still can, please generate another backtrace with libglib2.0-0-dbg and libgtk2.0-0-dbg installed. Using a debug build of gnome-nettool would also be helpful (information at http:// wiki.ubuntu. com/DebuggingPr ogramCrash).
Please also try under a new user account.