Setup LetsEncrypt with Nginx on Ubuntu

The first step is to add the certbot repo:

sudo add-apt-repository ppa:certbot/certbot

Next, update the package list:

sudo apt-get update

Next, install Certbot's Nginx package:

sudo apt-get install python-certbot-nginx

Next, request the certificate for your domain(s) you want secured:

sudo certbot --nginx -d -d

You'll then be asked if you want to redirect all non HTTPS traffic to HTTPS. I always choose this option which is option 2.

Certbot will get your SSL certificate for the requested domains and setup a cronjob which will run twice daily to ensure your certificates are up to date.