pip升级到8.1.1后出错

root@vps:~# pip list

Traceback (most recent call last):

  File "/usr/local/bin/pip", line 11, in <module>

    sys.exit(main())

  File "/usr/local/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 579, in setlocale

    return _setlocale(category, locale)

locale.Error: unsupported locale setting

root@vps:~# locale

locale: Cannot set LC_CTYPE to default locale: No such file or directory

locale: Cannot set LC_ALL to default locale: No such file or directory

LANG=en_US.UTF-8

LANGUAGE=

LC_CTYPE=UTF-8

LC_NUMERIC="en_US.UTF-8"

LC_TIME="en_US.UTF-8"

LC_COLLATE="en_US.UTF-8"

LC_MONETARY="en_US.UTF-8"

LC_MESSAGES="en_US.UTF-8"

LC_PAPER="en_US.UTF-8"

LC_NAME="en_US.UTF-8"

LC_ADDRESS="en_US.UTF-8"

LC_TELEPHONE="en_US.UTF-8"

LC_MEASUREMENT="en_US.UTF-8"

LC_IDENTIFICATION="en_US.UTF-8"

LC_ALL=

export LC_ALL="en_US.UTF-8"

export LC_CTYPE="en_US.UTF-8"