Thanks for your answer, pch.
Well, the Ultimate Edition server seems to be down agian (and for quite a while now) so I can't reaaly test my "theory"!
But:
1. I'm no expert on GPG myself but what is shown on your Authentications is nothing but the fingerprint (or maybe not even that, just the "reference" so to speak) of the actual GPG-key! It is shown there as a
reference given that it is as unique as the key itself.
2. The keys you have there seem (to me) to be of:
- The Ubuntu CD
- The Ubuntu official repos
- The Medibuntu repository ( have this one too)
- A key, belonging to Christian Marillat that might be either for Ultimate Edition or for Debian Multimedia (given as you have this one too). And as the e-mail of Marillat is on Debian, it's probably the later's, I'd think.
While I was finishing writing the above I also tried updating the repos - Ultimate Edition's is still down and one from Canonical also got down in the meantime!
It's pro'ly just NOT a good time of day to try and access them.