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How do I deal with “unauthenticated sources” errors in the Software Center?

i am using ubuntu 12.04 version. i am trying to install VLC media player through software centre. But I cant. Pop up message shows that "The action would require the installation of packages from not authenticated sources."

please guide me how to do install it? thanks in advance!

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marked as duplicate by hexafraction, theDefector, belacqua, fossfreedom Nov 2 '12 at 22:19

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1 Answer 1

simplest solution is that you download the installation package from VLC offical site

And install the downloaded package by double-click.

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