supernova_deb A few things:
ServerName should be
name.example.com (no .conf on the end).
Once you change your
ServerName you'll want to restart apache2 (on Ubuntu you'll use
sudo systemctl restart apache2)
Then you can run
certbot --apache and select your domain from the list.
Also, you need to make sure that once you get HTTPS set up, you enable port forwarding for port
443 to your server's internal IP address just like you did with port
80. (Port 443 is the HTTPS port)
Let me know if you have any other issues and sorry for the delay in responding!