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This question already has an answer here:

How can I determine which repository is being used for an installed packages? I have a few custom PPA repositories, and I'm concerned on one system whether the installed package is from one PPA or the other.

Thank you.

marked as duplicate by Panther, belacqua, Radu Rădeanu, Warren Hill, Eric Carvalho Jul 11 '13 at 11:02

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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If you install synaptic (sudo apt-get install synaptic), you can use it to view the sources of packages:

Synaptic

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