packaging(ppa): The repository does not have a Release file
PopShop fails to update after registering the ppa:
E: The repository 'http://ppa.launchpad.net/mmstick76/ion-shell/ubuntu focal Release' does not have a Release file.
W: Updating from such a repository can't be done securely, and is therefore disabled by default.
W: See apt-secure(8) manpage for repository creation and user configuration details
Pop!_OS 20.20LTS