Every Paint application I am trying to install from the Software Centre (that's GNU Paint, mtPaint, XPaint, Mypaint, rgbPaint) comes up with the error message "Requires installation of untrusted packages - The action would require the installation of packages from unauthenticated sources." I click OK and the installation stops! WHY are these packages even in the Software Centre if that happens, and how can I install at least ONE of them?
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