error en pytho2.6-Ubuntu 11.10

Checking for installed Python... got it!

Traceback (most recent call last):

  File "<string>", line 1, in <module>

  File "/home/tony/blender/.blender/scripts/yafaray_ui.py", line 94, in <module>

    import yaf_export

  File "/usr/share/yafaray/blender/yaf_export.py", line 15, in <module>

    import tempfile

  File "/usr/lib/python2.6/tempfile.py", line 34, in <module>

    from random import Random as _Random

  File "/usr/lib/python2.6/random.py", line 47, in <module>

    from os import urandom as _urandom

ImportError: cannot import name urandom