ImportError: ('Unable to load OpenGL library', 'GL: cannot open shared object file: No such file or directory', 'GL', None)

pierre@pierre-MacBook:~$ snowballz
Traceback (most recent call last):
  File "snowballz.py", line 12, in <module>
    from player import Player
  File "/usr/share/games/snowballz/player.py", line 2, in <module>
    import ai
  File "/usr/share/games/snowballz/ai.py", line 2, in <module>
    import data
  File "/usr/share/games/snowballz/data.py", line 4, in <module>
    import textures
  File "/usr/share/games/snowballz/textures.py", line 2, in <module>
    from OpenGL.GL import *
  File "/usr/lib/pymodules/python2.7/OpenGL/GL/__init__.py", line 2, in <module>
    from OpenGL.raw.GL import *
  File "/usr/lib/pymodules/python2.7/OpenGL/raw/GL/__init__.py", line 6, in <module>
    from OpenGL.raw.GL.constants import *
  File "/usr/lib/pymodules/python2.7/OpenGL/raw/GL/constants.py", line 7, in <module>
    from OpenGL import platform, arrays
  File "/usr/lib/pymodules/python2.7/OpenGL/platform/__init__.py", line 36, in <module>
    _load()
  File "/usr/lib/pymodules/python2.7/OpenGL/platform/__init__.py", line 27, in _load
    plugin_class = plugin.load()
  File "/usr/lib/pymodules/python2.7/OpenGL/plugins.py", line 14, in load
    return importByName( self.import_path )
  File "/usr/lib/pymodules/python2.7/OpenGL/plugins.py", line 28, in importByName
    module = __import__( ".".join(moduleName), {}, {}, moduleName)
  File "/usr/lib/pymodules/python2.7/OpenGL/platform/glx.py", line 8, in <module>
    class GLXPlatform( baseplatform.BasePlatform ):
  File "/usr/lib/pymodules/python2.7/OpenGL/platform/glx.py", line 20, in GLXPlatform
    raise ImportError("Unable to load OpenGL library", *err.args)
ImportError: ('Unable to load OpenGL library', 'GL: cannot open shared object file: No such file or directory', 'GL', None)
pierre@pierre-MacBook:~$

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: snowballz 0.9.5.1-2.1
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic i686
Architecture: i386
Date: Mon Jul 11 15:26:19 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=fr_FR:en
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: snowballz
UpgradeStatus: No upgrade log present (probably fresh install)