Today, 20 March 2013, XUbuntu has sent me several upgrades, but when I clicked INSTALL, I got this message: "Requires installation of untrusted packages from not authenticated sources." Since I was unable to find any way of overriding or cancelling that message, I have been unable to download the updates. How can Ubuntu consider itself a "not authenticated source"? More important, how can I download the upgrades?
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