git clone https://github.com/letsencrypt/letsencrypt cd letsencrypt/ ./letsencrypt-auto --help --debug Updating letsencrypt and virtual environment dependencies...... Requesting root privileges to run with virtualenv: /root/.local/share/letsencrypt/bin/letsencrypt --help letsencrypt-auto [SUBCOMMAND] [options] [-d domain] [-d domain] ... The Let's Encrypt agent can obtain and install HTTPS/TLS/SSL