Fedora Core FTW!!
I myself have never had a issue with Kubutnu/Ubuntu/Xubuntu finding my drives. But I don't run a RAID setup or anything like that, so I have no idea really on how to fix it.
I take it you've hit the forums? There has to be somebody out there that has that board and Ubuntu, that knows how to get it to work.
Have you made a thread on the Kubuntu forums?