<div class="gmail_quote">On 14 August 2010 08:20, Gordon Burgess-Parker <<a href="mailto:gbplinux@gmail.com">gbplinux@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> 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? </blockquote></div> Solved - seems like the Sources list was corrupted - changed server and all seems to be well.