from the error it sounds like I have to update my certbot client, but I just want to make sure there is no other part to this I have to do.
because before doing anything, I upgraded
$ sudo apt-get update $ sudo apt-get install --only-upgrade certbot
and got the message:
certbot is already the newest version (0.31.0-1+ubuntu16.04.1+certbot+1). 0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.
Am I really finished without doing anything?