Companion/Quickstart bash script to manually install and use Certbot with key command steps as outlined in the post https://mzonline.com/blog/2020-10/moving-certbot-lets-encrypt

Certbot-Ubuntu-Quickstart.sh

# Update Ubuntu and obtain/install/update Certbot
sudo apt-get update
sudo apt-get install software-properties-common
sudo add-apt-repository universe
sudo add-apt-repository ppa:certbot/certbot
sudo apt-get update

# Make a manual certificate request
sudo certbot certonly --manual -d superdomain.net

# Spit out the freshtly-minted certificate:
sudo more /etc/letsencrypt/live/superdomain.net/cert.pem

# Spit out the certificate key:
sudo more /etc/letsencrypt/superdomain.net/privkey.pem