I tried to dual boot Win7/Ubuntu, but the installer wouldn't recognize the free space on my hard drive, so I followed the advice of erasing RAID metadata with the command
dmraid -E -r /dev/sda and that let me install Ubuntu, but when I rebooted my computer I was greeted with grub rescue.
Then, I tried to re-install Ubuntu, this time erasing the disk and completely disregarding Windows. I was hoping a fresh install would fix grub (as I don't care about Win), but I still get either grub rescue prompt, or (hd0) not found. The hard drive shows in fdisk and gparted.