I have the same result, although in my case, the command I had run was 'apt-get dist-upgrade' and there were no packages kept back. By "the same result", I mean that except for cosmetic things like the timestamp, the reported download speed, and the width of the wget download-progress bar, the output appears to be exactly identical. Looking at the scripts involved, I don't see anything that looks obviously different from what this seems to have been before; it's still just invoking 'apt-get check', reacting to the exit status, and returning success. That leads me to think that the difference must be the result of a change in the behavior of 'apt-get check', which would mean that the most likely cause is a change in apt itself. Looking at the apt changelog (from the uploads to experimental over the months of the release freeze), I see a few things which could maybe if the circumstances are right be handwaved as being related; however, I don't know the libdvd-pkg design well enough to be able to judge which of them might actually be related, and I'm not currently inclined to grab the apt source and start digging to see what 'apt-get check' is actually doing now that might be different from the last time this was known to be working. I do want to note that after getting this error, I ran 'dpkg-reconfigure libdvd-pkg' as suggested elsewhere, and saw it complete with no errors.
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