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When I try to update using update manager I get :

Requires installation of untrusted packages The action would require the installation of packages from not authenticated sources.

When I try to install any thing via software center I get the same error but this time with an option of repair

Failed to download repository information Check your Internet connection.

I looked for some solutions for this problem and one of them was to change the mirrors (servers) but when I try to change by choosing a specific server nothing happens ,the problem still there.

And when I choose: select best server I get :

No suitable download server was found Please check your Internet connection.

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I've solved it by disabling the proxy.

Go to System Settings, then Network, Network proxy and on method chose None.

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