How to Upgrade Let's Encrypt ACMEv1 protocol to an ACMEv2 - If you got email by let's encrypt like this : "Beginning June 1, 2020, we will stop allowing new domains to validate using the ACMEv1 protocol. You should upgrade to an ACMEv2 compatible client before then, or certificate issuance will fail. For most people, simply upgrading to the latest version of your existing client will suffice." you need to upgrade your let's encrypt.
Maybe you ask When using certbot with nginx, how can I get it to use acmev2? okay, you follow this step to upgrade your let's encrypt:
-> I would recommend to first try and update certbot with the following commands:
sudo apt update
sudo apt install --only-upgrade certbot
-> Then run the following command and add your email:
sudo certbot update_account
Press enter and after that Press I or Y and hit enter on popup question.
-> Then you can see ACME V2 option listed under the following folder:
/etc/letsencrypt/accounts/
-> And then just verified using the simulation command below:
certbot renew --dry-run
-> And finally now you can add new certbot without error
sudo certbot --nginx -d example.com -d www.example.com
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