pkg install py36-certbot

or

pkg install py27-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
sudo apt-get install certbot

certbot --manual certonly -d *.domain.com

• This will ask you to make a TXT record for verification.