@justoverclock Ok, that’s because you have no wildcard DNS record, and it’s attempting to renew for domains you don’t have listed in DNS .
Select the second option, and enter
justoverclock.it and proceed that way.
Note, that there is a rate-limit set to 10 per hour, so if you exceed this, you’ll need to wait for a while then try again. In this case, you’d see this message
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator webroot, Installer None
Renewing an existing certificate
An unexpected error occurred:
There were too many requests of a given type :: Error creating new order :: too many failed authorizations recently: see https://letsencrypt.org/docs/rate-limits/
Please see the logfiles in /var/log/letsencrypt for more details.