I found this same error after upgrading to precise pangolin and
activating my virtualenv. I was able to work around it by creating a
fresh virtualenv which worked as expected, I just had to reinstall all
python libs into the new virtualenv.

Error messages I saw:

When trying to run nosetests:

  File "/usr/lib/python2.7/multiprocessing/process.py", line 309, in __init__
    self._authkey = AuthenticationString(os.urandom(32))
AttributeError: 'module' object has no attribute 'urandom'

When trying to run pip:

  File "/usr/lib/python2.7/random.py", line 47, in <module>
    from os import urandom as _urandom
ImportError: cannot import name urandom

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https://bugs.launchpad.net/bugs/989856

Title:
  import random fails because _urandom is unavailable

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