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Adding Software Sources

Other sources of software available for Ubuntu are out there that you might need or like to set up. You can access them using the Other Software tab in the Software Sources tool, shown in Figure 20-5.

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Figure 20-5. The Other Software tab at the Software Sources tool

By default you will see the Canonical partner repositories, of which the main component is selected and the source code component is not. This is the software source listed under Canonical Partners in the Ubuntu Software Center. You can also add PPAs and other software sources.

The PPAs or Personal Package Archives are repositories hosted by Canonical in its Launchpad service, on behalf of third-party developers. A developer can activate a PPA, and Launchpad will generate a unique key to sign any package contained in that PPA. The developer can then submit the source code for its applications, and the people at Canonical build the binaries and packages needed to install the application. Ubuntu users benefits from this collaboration because they can add those PPAs to their software sources and install the applications with Ubuntu Software Center. Note that the software contained in a PPA is considered untrusted by Canonical, so extra care should be taken.


  

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