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== 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.== 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"