Install fails on Ubuntu 20.04 - Certbot PPA is depleted on Ubuntu 20.04

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When trying to install Ubuntu 20.04 using Let's Encrypt, the script terminates when it's updating packages due to the error below.

E: The repository 'http://ppa.launchpad.net/certbot/certbot/ubuntu focal Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

According to this:
https://askubuntu.com/questions/1233535/focal-ppa-launchpad-missing-release-file
and
https://community.letsencrypt.org/t/unable-to-add-ppa-certbot-certbot-in-ubuntu-20-0-4-lts/123194

Certbot PPA is depleted on Ubuntu 20.04