Ign:1 http://ppa.launchpad.net/certbot/certbot/ubuntu focal InRelease Err:2 http://ppa.launchpad.net/certbot/certbot/ubuntu focal Release 404 Not Found [IP: 91.189.95.85 80] code example
Example: error ppa.launchpad.net/certbot/certbot/ubuntu focal Release
sudo apt-add-repository -r ppa:certbot/certbot