It [...-linux-igd] wasn't there just now (practically all day today that is). I've gotten around medibuntu's server move so that isn't the problem. If for some extremely unlikely reason this matters: The latest upgrades to the LIRC stuff makes my lirc_mceusb not work any more. As I said I doubt that is it, but who knows?
[SOLVED: Although I had done "apt-get update" a couple of times within the past 24 hours, the /var/lib/apt/lists/deb.* file seemed to be a few days older than the one in deb.linuxmce.com so I forcibly deleted the file and reran apt-get update then dist-upgrade and it's fine now. Must have been something wrong with apt (and/or the timestamping on the packages.gz file on deb.linuxmce?)]