Crear un sandbox en virtualenv con python 2.7 ¿falla en ubuntu?

Question

¿Por qué es virtualenv quejándose de falta _weakrefset

laptop:~/sandbox$ virtualenv --python=/usr/bin/python2.7 --no-site-packages play 
Running virtualenv with interpreter /usr/bin/python2.7 
New python executable in play/bin/python2.7 
Also creating executable in play/bin/python 
Traceback (most recent call last): 
    File "/home/ribery/sandbox/play/lib/python2.7/site.py", 
    line 67, in <module> 
    import os 
    File "/home/ribery/sandbox/play/lib/python2.7/os.py", line 398, 
    in <module> 
    import UserDict 
File "/home/ribery/sandbox/play/lib/python2.7/UserDict.py", line 83, 
    in <module> 
    import _abcoll 
File "/home/ribery/sandbox/play/lib/python2.7/_abcoll.py", line 11, 
    in <module> 
    from abc import ABCMeta, abstractmethod 
File "/home/ribery/sandbox/play/lib/python2.7/abc.py", line 8, 
    in <module> 
    from _weakrefset import WeakSet 
ImportError: No module named _weakrefset 
ERROR: The executable django-py27/bin/python2.7 is not functioning 
ERROR: It thinks sys.prefix is '/home/ribery/sandbox' 
(should be '/home/ribery/sandbox/play') 
ERROR: virtualenv is not compatible with this system or executable 

Answer 1

Ver https://github.com/pypa/virtualenv/issues/76

Para uso con Python 2.7, actualización virtualenv a 1.5.1 o posterior. Puede verificar su versión actual con virtualenv --version.