Adding Extra Software Repositories

The Ubuntu software repositories contain more than 30,000 packages—enough to last a lifetime, or so you might think. But as it turns out, a whole world of software is waiting for you outside the official Ubuntu repositories, and it's not much more difficult to reach. Various individuals and companies compile small numbers of packages that are not available in Ubuntu into their own third-party repositories. These are typically free to access, if you can find them. All you need to do is tell APT to search for packages in one of these repositories as well as Ubuntu's, and you'll be able to get at the extra software.

Each repository has its own APT line. This is similar to a web address but contains extra information ...

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