Having issues with setting up SSL certificate using Certbot while following your documentation

Hello, I have been trying to setup an SSL certificate for my django website that I am currently hosting on one of my droplets. I have been following this tutorial to do it, but I have gotten stuck due to an issue with installing (https://www.digitalocean.com/community/tutorials/how-to-secure-apache-with-let-s-encrypt-on-ubuntu-18-04). The issue says: E: Package ‘python-certbot-apache’ has no installation candidate. I am currently using apache as a web server. Thank you in advance for your time and help :) . It is greatly appreciated. http://prntscr.com/10we05w