E: The repository ‘http://ppa.launchpad.net/certbot/certbot/ubuntu focal Release’ does not have a Release file. December 10, 2020December 10, 2020 Gareth Eaton I got rid of the error message on Ubuntu 20.04 by removing the ppa repository. sudo apt-add-repository -r ppa:certbot/certbotAfter that,sudo apt updatesudo apt-get update