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I was trying to install Let’s Encrypt SSL certificate through Virtualmin interface, and I got this error:
Error registering: Account creation on ACMEv1 is disabled. Please upgrade your ACME client to a version that supports ACMEv2 / RFC 8555. See https://community.letsencrypt.org/t/end-of-life-plan-for-acmev1/88430 for details.
Hi friend, just open ssh client (like putty) and connect to your server, then run this command:
apt-get install socat certbot
this will update the ACME client, and everything will be fine.