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Possible Duplicate:
I can't install software from the software center

After I press install it says:

Please check your internet connection

After I click ok, it says:

Require installation of untrusted packages , The action would required the installation of packages from not authenticated source

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marked as duplicate by Oli Jan 10 '12 at 9:20

This question was marked as an exact duplicate of an existing question.

Whenever this happens to me, I install them through synaptic or the terminal and it works fine. – Thomas Boxley Dec 31 '11 at 2:29

The second part of the problem ("require installation of untrusted packages...") looks like a duplicate of Updates don't install because of "untrusted packages"

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