I've tried everything (I think) and I can't renew

I agree, that post has this entry by @dany-sh in it which looks promising:

I found a way to get this work :slight_smile:

 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.

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