Update your client software to continue using Let's Encrypt

Okay thanks :wink:

sudo apt list --upgradeable

says

python3-acme/xenial 0.31.0-2+ubuntu16.04.6+certbot+2 all [upgradable from: 0.25.1-1+ubuntu16.04.1+certbot+1]

anything else that should be ugraded?

How can I confirm that ACMEv2 is in play?

kind regards Hubertus