[pip]locale.Error: unsupported locale setting

root@iZj6c3ru5234oqhlkiphcnZ:~/back# pip install virtualenv
Traceback (most recent call last):
  File "/usr/bin/pip", line 11, in <module>
    sys.exit(main())
  File "/usr/lib/python2.7/dist-packages/pip/__init__.py", line 215, in main
    locale.setlocale(locale.LC_ALL, '')
  File "/usr/lib/python2.7/locale.py", line 581, in setlocale
    return _setlocale(category, locale)
locale.Error: unsupported locale setting

fix

root@iZj6c3ru5234oqhlkiphcnZ:~/back#  export LC_ALL=C