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Let's say I want to verify if some PPAs aren't being used so I can minimize conflicts or whatever else could happen. Is it possible to verify which PPAs are no longer in use?

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One method is to use Ubuntu Software Center. Open it and use the arrow down next to "installed". It will list (from bottom up) PPA's installed:

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When you click on a PPA (TLP as an example) it will list the software included in this PPA. A green 'tick' means the software is installed. If none are the PPA is unused.

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