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The default software repository locations for apt are set up for you when you install your Linux distribution. The repository locations are stored in the file /etc/apt/sources.list.

In most cases, you will never need to add or remove a software repository, so you won't need to touch this file. However, apt will only pull software from these repositories. Also, when searching for software to install or update, apt will only check these repositories. If you need to include some additional software repositories for your package management system, this is the place to do it.