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You can add a repository without editing the sources.list file by defining additional source repository lists. You can place files in /etc/apt/sources.list.d The /etc/apt/sources.list.d directory provides a way to add sources.list entries in separate files. This seems unnecessarily "careful" however, some are more comfortable with this method.You can also add a repository without editing the sources.list file by defining additional source repository lists. You can place files in /etc/apt/sources.list.d The /etc/apt/sources.list.d directory provides a way to add sources.list entries in separate files. This seems unnecessarily "careful" however, some are more comfortable with this method.[http://ubuntuguide.org/wiki/Ubuntu_Trusty_Packages_and_Repositories Ubuntu Trusty Packages and Repositories] - focused on both Ubuntu and Kubuntu covering Unity, Gnome, and KDE. Extensive details on repository management. [http://ubuntuguide.org/wiki/Ubuntu_Trusty_Packages_and_Repositories Ubuntu Trusty Packages and Repositories] - focused on both Ubuntu and Kubuntu covering Unity, Gnome, and KDE. Extensive details on repository management. [https://help.ubuntu.com/community/Repositories/Ubuntu Ubuntu Community Help Wiki: Repositories/Ubuntu] - this information is not always current.