That's gnome-panel-dbgsym in fact, you can get it by using the apt source described on https://wiki.ubuntu.com/DebuggingProgramCrash
-- [apport] gnome-panel crashed with SIGSEGV https://launchpad.net/bugs/84250 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
