解决安装虚拟环境出现的问题（OSError: Command /home/python/.virtua...ngo3_web/bin/python

python3的报错解决：

OSError: Command /home/python/.virtua…ngo3_web/bin/python3 - setuptools pkg_resources pip wheel failed with error code 2

出现上面的这个错误，依次输入以下两个命令

成功更新后，再次安装虚拟环境，便可以安装成功了

python2的报错：

OSError: Command /root/.local/share/letsencrypt/bin/python2.7 - setuptools pkg_resources pip wheel failed with error code 2 #4062

python@bogon:~$ pip -V

pip 8.1.2 from /usr/local/lib/python2.7/dist-packages (python 2.7)

python@bogon:~$ sudo pip install --upgrade pip

python@bogon:~$ mkvirtualenv datana