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Possible Duplicate:
How to bypass/remove/disable the untrusted package authentication

When i try to install softwares from software centre i get an error message as follows :

Requires installation of untrusted packages

in details the following is mentioned:

libcddb2 libdvbpsi7 libebml3 libiso9660-8 libmatroska5 libresid-builder0c2a libsdl-image1.2 libsidplay2 libtar0 libupnp3 libva-x11-1 libvcdinfo0 libxcb-composite0 libxcb-keysyms1 libxcb-randr0 libxcb-xv0

Whether I click on OK or Repair either ways the window closes and I cannot download & install the software.

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marked as duplicate by hexafraction, stephenmyall, con-f-use, Jorge Castro, RolandiXor Oct 22 '12 at 18:05

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

Check out this article. http://www.liberiangeek.net/2010/10/fix-requires-installation-untrusted-packages-error-ubuntu-10-10-maverick-meerkat/

Even if they are talking about version 10.10 i believe the solution they provide will help you. The key is to use the underlined number and make sure you update your package repository.

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Please include details from the link. Thanks! – hexafraction Oct 22 '12 at 11:10

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