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=== About Repositories ===# Main - preconfigured and your main Ubuntu support software# '''Main''' - preconfigured and your main Ubuntu support software repository# Restricted - software with restricted licensing# '''Restricted''' - software with restricted licensing# Universe - third-party free and open source software# '''Universe''' - third-party free and open source software # Multiverse - commercial software, closed source, free or pay# '''Multiverse''' - commercial software, closed source, free or payThe Ubuntu installer references both Main and Restricted when adding components during installation. These repositories, or sometimes called repos for short, are already defined in your repositories sources list: /etc/apt/sources.list View them:The Ubuntu installer references both Main and Restricted when adding components during installation. These repositories, or sometimes called repos for short, are already defined in your repositories sources list: '''/etc/apt/sources.list''' View them:===Add Repositories using Synaptic Package Manager===From within the desktop environment:* Menu -> System -> Administration -> Synaptic Package Manager -> Settings -> RepositoriesFor Third Party Software select Add -> enter the repository's address.Example: Repositories graphical interface (System -> Software and Updates)[[File:ubuntu-software-repositories01.jpg]]=== add Repositories from the command line === sudo apt-add-repository ppa:user/repositoryWhen the repository name has a format similar to the following, enclose the repository name in quotation marks: sudo apt-add-repository "deb http://repository.example.org trusty stable"Example: We want to install, as an example, the Classic Gnome Menu in Ubuntu 14.04. Here is the entire process from adding the repository, refreshing, and running the new software. See below:{{:Install_and_Launch_the_Classic_Gnome_Menu_in_Ubuntu_14.04}}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.=== remove Repositories from the command line ===The repository can be removed also using the add-apt-repository command. sudo add-apt-repository --remove ppa:user/repository sudo apt-get update=== External Resources ===[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.[[Category:Computer_Technology]][[Category:Linux]][[Category:Ubuntu]]