Error while trying to create cert


I’m having a problem trying to get a certificate in my ubuntu server.
When i run the command ./letsencrypt-auto certonly after some minutes i get this error:

Command "/root/.local/share/letsencrypt/bin/python2.7 -c "import setuptools, tokenize;__file__='/tmp/pip-build-VEX6z1/cryptography/';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-5C0Eh3-record/install-record.txt --single-version-externally-managed --compile --install-headers /root/.local/share/letsencrypt/include/site/python2.7/cryptography" failed with error code 1 in /tmp/pip-build-VEX6z1/cryptography

I’ve done the same setup in 2 other servers with no problem.


the post at Failed with "/tmp/pip-build-NISEZn/cryptography" may help