Upgrade to ACMEv2... what does it exactly mean?

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Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. crt.sh | example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.

My domain is:

I ran this command:

It produced this output:

My web server is (include version):nginx

The operating system my web server runs on is (include version):Ubuntu 16.04

My hosting provider, if applicable, is: AWS

I can login to a root shell on my machine (yes or no, or I don't know):yes

I'm using a control panel to manage my site (no, or provide the name and version of the control panel):no

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot):0.21.1

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The message means you need to upgrade your version of Certbot.

You can find the instructions for your operating system here: https://certbot.eff.org/lets-encrypt/ubuntuxenial-nginx

If you installed Certbot from apt, you can also just upgrade the certbot package and it should be sufficient.

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