Comment 8 for bug 413497

here is the terminal output

Error: couldn't find RGB GLX visual or fbconfig
Failed to start shell
Cannot register the panel shell: there is already one running.
Window manager warning: Screen 0 on display ":0.0" already has a window manager; try using the --replace option to replace the current window manager.
Traceback (most recent call last):
  File "/usr/bin/gnome-shell", line 278, in <module>
    shell = start_shell()
  File "/usr/bin/gnome-shell", line 135, in start_shell
    (server_glx_extensions, client_glx_extensions, glx_extensions) = _get_glx_extensions()
  File "/usr/bin/gnome-shell", line 73, in _get_glx_extensions
    server_glx_extensions = set(re.split("\s*,\s*", glxinfo_map['server glx extensions'].strip()))
KeyError: 'server glx extensions'