Checking for new version...
Creating virtual environment...
Installing Python packages...
Installation succeeded.
Requesting root privileges to run letsencrypt...
/root/.local/share/letsencrypt/bin/letsencrypt --quiet
Version: 1.1-20080819
Missing command line flags. For non-interactive execution, you will need to specify a plugin on the command line. Run with '--help plugins' to see a list of options, and see
https://eff.org/letsencrypt-plugins for more detail on what the plugins do and how to use them.