E: Failed to fetch http://ppa.launchpad.net/jonathonf/gcc-9.0/ubuntu/dists/bionic/InRelease 403 Forbidden [IP: 2001:67c:1560:8008::19 80] 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