Comment 13 for bug 563060

this issue should be fixed by a rebuild due to the recent python-defaults sync:
https://launchpad.net/ubuntu/+source/python-defaults/2.7.2-4ubuntu1

python-defaults (2.7.2-2) experimental; urgency=low

  [ Piotr Ożarowski ]
    - remove setuptools from requires.txt (it is replaced with
      python-pkg-resources Debian dependency)