Certbot is down after trying to upgrade using apt-get install --only-upgrade certbot

That option doesn't help with issuance problems. It will most likely only cause harm like hitting rate limits. Please don't use it.

Also, ACMEv1 has been deprecated for some time now. It originated almost two years already now. See the following thread for more info:

By the way, it seems the link to the thread above is a part of the error message you've received, so it shouldn't be news to you.

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