Attempting to renew cert (exampledomain) from /etc/letsencrypt/renewal/exampledomain.conf produced an unexpected error: urn:ietf:params:acme:error:malformed :: The request message was malformed :: Method not allowed. Skipping.
All renewal attempts failed. The following certs could not be renewed:
/etc/letsencrypt/live/exampledomain/fullchain.pem (failure)
Attempting to renew cert (lightyears-comm.com) from /etc/letsencrypt/renewal/lightyears-comm.com.conf produced an unexpected error: urn:acme:error:serverInternal :: The server experienced an internal error :: ACMEv1 is deprecated and you can no longer get certificates from this endpoint. Please use the ACMEv2 endpoint, you may need to update your ACME client software to do so. Visit End of Life Plan for ACMEv1 - #27 by jillian for more information.. Skipping.
All renewal attempts failed. The following certs could not be renewed:
/etc/letsencrypt/live/lightyears-comm.com/fullchain.pem (failure)
Which version of certbot are you on now? As the error mentions ACME v1 has been retired a while ago.
Which OS version are you on?
There was good form you can fill out when you start a new post for help, it has all the usual questions you need to answer for people to be able to help you.
Ok, the version of certbot that's distributed through apt is very old, to proceed I believe the best (most supported) course of action is to install snap, uninstall older versions of certbot then use the newer snap distribution of certbot. Here are the instructions for your platform (Apache and Ubuntu 16.04: Certbot - Ubuntuxenial Apache). I can't advise on any other aspects of the upgrade but I'd suggest working on a snapshot clone of your system before you do the real upgrade, if you can.
Your Ubuntu version is also very old (2016) so you should consider how you are going to migrate your websites to a newer operating system before it stops receiving security updates etc. I believe that version is already out of support for users who don't have an extended agreement with Ubuntu.
Sorry Sir, I am not perfect and I am not saying that this is a good solution for everyone. This depends what I melt my problem on my end. This command can solved out only my problem. I hope you can understand.