https://www.baeldung.com/linux/letsencrypt-renew-ssl-certificate-automatically

sudo apt-get install software-properties-common

sudo apt-get update

sudo apt-get install certbot

# this did not work
sudo apt-get install python-certbot-apache
#this did!
sudo apt-get install python3-certbot-apache

sudo certbot --apache

To manually renew

sudo certbot renew --apache