LetsEncrypt

Let's Encrypt on Ubuntu server

First update the server

sudo apt update
sudo apt upgrade
sudo apt autoremove

Apache

Then run these command to install and config certbot

sudo apt install certbot python3-certbot-apache
sudo apache2ctl configtest
sudo systemctl reload apache2
sudo ufw allow 'Apache Full'

sudo certbot --apache

Check auto renewal status

sudo systemctl status certbot.timer

nginx

Then run these command to install and config certbot

sudo apt install certbot python3-certbot-nginx
sudo systemctl reload nginx

sudo certbot --nginx

Check auto renewal status

sudo systemctl status certbot.timer