I would like to run the reverse of this command to remove the non-compatible repository in Debian 8.1sudo add-apt-repository -y ppa:nemh/systembackwhere the command add-apt-repository is in the package software-properties-common. I could not find the systemback entry in /etc/apt/sources.list.How can you run the reverse of the command?
How to apt-delete-repository?
debian;apt
To remove a repository, you have to do 2 things:Remove it from sources.list.If it was added by add-apt-repository then you will find it in its own file in /etc/apt/sources.list.d, not in the main sources.list.sudo rm /etc/apt/sources.list.d/nemh-systemback-precise.listOptional: Stop trusting the keyUse apt-key list to list trusted keys. Look for an entry like Launchpad PPA for Kendek in this case. Then use apt-key del to delete it:sudo apt-key del 73C62A1B