(gdb) supertux Undefined command: "supertux". Try "help". (gdb) run Starting program: /usr/games/supertux (no debugging symbols found) Failed to read a valid object file image from memory. (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) [Thread debugging using libthread_db enabled] [New Thread -1216399680 (LWP 7742)] (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) [/home/david/.supertux2] is in the search path [/usr/share/games/supertux] is in the search path (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) [New Thread -1216525424 (LWP 7745)] Invalid button '0' in buttonmap Invalid button '1' in buttonmap (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) [New Thread -1225286768 (LWP 7749)] supertux: xcb_xlib.c:50: xcb_xlib_unlock: Assertion `c->xlib.lock' failed. ---Type to continue, or q to quit---bt full Program received signal SIGABRT, Aborted. [Switching to Thread -1216399680 (LWP 7742)] 0xffffe410 in ?? ()