参考：

Error: “No module named _markerlib” when installing some packages on virtualenv

Ubuntu 14.04 更新 setuptools 至 19.2 版本

wget https://pypi.python.org/packages/source/s/setuptools/setuptools-19.2.zip

unzip setuptools-19.2.zip

cd setuptools-19.2

python setup.py install

2018.7