The repository 'http://ppa.launchpad.net/dr-akulavich/lighttable/ubuntu focal Release' does not have a Release file. code example

Example 1: 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

Example 2: The repository 'http://ppa.launchpad.net/ubuntu-wine/ppa/ubuntu bionic Release' does not have a Release file.

wget -nc https://dl.winehq.org/wine-builds/Release.key
sudo apt-key add Release.key
sudo apt-add-repository https://dl.winehq.org/wine-builds/ubuntu/