The repository 'Cerbot' does not have a Release file.

Issue Recap

My server always shows this error, when I using the command “sudo apt update”:

The repository ‘http://ppa.launchpad.net/certbot/certbot/ubuntu focal Release’ does not have a Release file.

Figure Out

It can be solved with ease by removing the Cerbot ppa repository.

sudo apt-add-repository -r ppa:certbot/certbot

sudo apt update
sudo apt-get update

Reference:
https://stackoverflow.com/questions/60249177/e-the-repository-http-ppa-launchpad-net-certbot-certbot-ubuntu-focal-release