Just in the process of building my HTPC.
I have all the hardware together, and went to install Ubuntu on it tonight. I downloaded the ISO, and used the app to make a USB bootable installer.
I start the PC up, and it comes up with "Loading Grub 1.5" "Loading, please wait, Error 17" (Well something like that anyway). It doesn't even get to a boot menu or installer.
Hardware is Pentium 64bit, 4GB DDR, 1 x 200GB SATA, 2 x 2TB SATA (to be made into RAID)