Still no functional 64 bit debs??
Just FYI: I recently upgraded my desktop to run 64-bit Intrepid Kubuntu on one of the hard drives, and I successfully built binary deb installers on it, although I haven't uploaded and linked to them yet as the SVN branch is a bit unplayable right now, it appears that the air combat part of UFO interceptions is being re-vamped and isn't finished yet, last time I checked. This is the same reason I'm waiting to upload and link to a new Win32 installer as well.
When the SVN gets a little more developed and somewhat more stable, I suppose I could provide links for both Win32 and Kubuntu/Ubuntu 64-bit Intrepid, although I'd have to upload one at a time as my upload speed isn't the best (but also isn't the slowest, either).
I admit, however, that I haven't tested the deb installers and I'm not a linux expert, but they appear to have built properly.
Still, if anyone else who knows more about linux than I do wants to take care of it, they are more than welcome to.