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When I am trying to install a software from software center it show me this:

Requires installation of untrusted packages
The action would require the installation of packages from not authenticated sources.
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Did you change anything in the time since the last time it worked? – guntbert Feb 11 '13 at 20:55
Where are you installing this from? Is it from a PPA? – lolopop Feb 11 '13 at 20:56
possible duplicated: – Lucio Feb 11 '13 at 21:14
Also, possible duplicated: – Lucio Feb 11 '13 at 21:29

Have you modified any software sources? Did you download what you are trying to install from somewhere? If so, it is saying that the application is not trusted. You can choose to install it but you run the risk of an unstable system

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I installed medibuntu and then fetching this problem – user130324 Feb 11 '13 at 21:08

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