I am sorry, but more help than that is needed.
Today, I too received this cryptic email. Unfortunately I don’t have much time trying to understand what Certbot is doing on our server, and IF we need to do anything at all. Certbot was installed by a person that is no longer working with us.
To my understanding Certbot is supposed to make our life simpler by automating some SSL-related technical tasks, but for the moment it is doing the opposite.
Is there a straight-forward instruction for how to upgrade from certbot 0.26 to 0.28? The instructions for Ubuntu 14 and Apache (https://certbot.eff.org/lets-encrypt/ubuntuxenial-apache) are not easy to follow (it looks like full install instructions, not upgrade instructions). It starts describing “DNS plugins”. How do I know if that is even relevant for our system? It seems they are optional, but how do I check if we are using that? It says “If you want to obtain a wildcard certificate” - again, how do I check if we have that or not? “You’ll need to replace dns-plugin with the name of the DNS plugin you want to use” - how am I supposed to figure THAT out? - and there the instructions end.
Any help with checking our installation and moving up to version 0.28 with minimum effort will be very much appreciated!
(I also have very hazy notions of what is “ACME” and “TLS-SNI-01”)