How to secure your sites with Let’s Encrypt on Ubuntu

You can install the Certbot utility in Ubuntu using the official PPA (Personal Package Archive).

First, install the software-properties-common package, if you don’t already have this.

apt install software-properties-common

Next, install the repo, update the apt database and install the module for your chosen web service.

For Apache

add-apt-repository ppa:certbot/certbot
apt update
apt install certbot python3-certbot-apache

or for NGINX

apt install python-certbot-nginx

There after you can use the same methods to install a certificate as previously mentioned for Apache and NGINX