$ virtualenv /home/uri/bin/virtualenv
New python executable in /home/uri/bin/virtualenv/bin/python2.7
Also creating executable in /home/uri/bin/virtualenv/bin/python
Traceback (most recent call last):
  File "/home/uri/bin/virtualenv/lib64/python2.7/site.py", line 66, in
<module>
    import os
  File "/home/uri/bin/virtualenv/lib64/python2.7/os.py", line 49, in
<module>
    import posixpath as path
  File "/home/uri/bin/virtualenv/lib64/python2.7/posixpath.py", line
17, in <module>
    import warnings
ImportError: No module named warnings
ERROR: The executable /home/uri/bin/virtualenv/bin/python2.7 is not
functioning
ERROR: It thinks sys.prefix is '/home/uri' (should be
'/home/uri/bin/virtualenv')
ERROR: virtualenv is not compatible with this system or executable
$

Система --- свежий Сизиф, Питон 2.7.