I agree, that post has this entry by @dany-sh in it which looks promising:
I found a way to get this work
pip install pip --upgrade
pip install virtualenv --upgrade
virtualenv -p /usr/bin/python27 venv27
. venv27/bin/activate
git clone https://github.com/letsencrypt/letsencrypt
cd letsencrypt
unset PYTHON_INSTALL_LAYOUT
Then update letsencrypt:
./letsencrypt-auto -v
And run the command to renew your certificate.