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# Main - preconfigured and your main Ubuntu support software# '''Main''' - preconfigured and your main Ubuntu support software# 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: