Did you install Kubuntu with the default kernel? I was under the impression that the default kernel detects whether the PC has SMP capabilities. This way, you don't need to specify a particular kernel depending on the number of processors/cores.
Not I'm just going to do that. I have Plutohome installation with similar case. When I install server I chose the kernel type manually (there is a choice between usual and SMP kernel). But when I installed MD with core duo the system didn't give me a chance to specify kernel for MD. It detected processor automatically and tried to boot SMP kernel but since the server had usual kernel the installation was crashed. So, I'm worry about similar problem with LinuxMCE. That's why I asked people about success installation of core duo MD with one core server.