The program 'gthumb' received an X Window System error. This probably reflects a bug in the program. The error was 'GLXBadContext'. (Details: serial 143 error_code 167 request_code 152 minor_code 6) (Note to programmers: normally, X errors are reported asynchronously; that is, you will receive the error a while after causing it. To debug your program, run it with the GDK_SYNCHRONIZE environment variable to change this behavior. You can then get a meaningful backtrace from your debugger if you break on the gdk_x_error() function.) Trace/breakpoint trap (core dumped)