Pycrypto安装失败Travis CI

Question

我在UnicodeDecodeError期间在我的Travis CI版本上获得pip install pycrypto。

Traceback (most recent call last):
  File "/home/travis/virtualenv/python2.7/bin/pip", line 11, in <module>
    sys.exit(main())
  File "/home/travis/virtualenv/python2.7/local/lib/python2.7/site-packages/pip/__init__.py", line 185, in main
    return command.main(cmd_args)
  File "/home/travis/virtualenv/python2.7/local/lib/python2.7/site-packages/pip/basecommand.py", line 161, in main
    text = '\n'.join(complete_log)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 36: ordinal not in range(128)

https://travis-ci.org/ruslanosipov/rblog/builds/21724008

任何提示在哪里寻找解决方案？我不能在本地重现这个。