The repository 'http://ppa.launchpad.net/cairo-dock-team/ppa/ubuntu groovy Release' does not have a Release file. code example

Example: E: The repository 'http://ppa.launchpad.net/webupd8team/atom/ubuntu focal Release' does not have a Release file. 404 error remove

sudo add-apt-repository --remove ppa:mc3man/trusty-media