My domain is: isbd.uk plus several new ones
My web server is (include version): apache2
The operating system my web server runs on is (include version): ubuntu 18.04
I can login to a root shell on my machine (yes or no, or I don't know): yes
I have been running Letsencrypt for many years on isbd.uk which is a virtual server running Ubuntu 18.04 on Gandi Internet. I have root access etc.
It's an old LetsEncrypt installation, I have just been running letsencrypt-auto to update the certificate when I'm notified about expiration. (it''s so old it uses python virtual environments)
I want to add some more web sites to the apache server as virtual domains, so I need certificates for them. I gather it's possible to use a single certificate for multiple sites but that's as far as my knowledge goes.
What's going to be the easiest way to migrate to a modern LetsEncrypt/Certbot installation that will support multiple domains?