Using sources.list file If you want to add repositories for ubuntu you need to add in /etc/apt/sources.list file before adding any new repositories take backup of this file and add more repositories. #cp -p /etc/apt/sources.list /etc/apt/sources.list_backup #vi /etc/apt/sources.list Replace everything with the following lines To use your local mirror you can add “cc.” before archive.ubuntu.com (cc = your country [...]