For those trying to install Hardy on the new Dell 530S (or similar Dells), I'll save you a lot of hassle - this is the thread to read:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/153702
I wasted a lot of time trying all sorts of things to disable the sata drivers to get around all the "revalidaton failed" errors etc, but in the end found this thread (much lower down the search results). Dell ship with the SATA controller in IDE mode in the BIOS for easy windows installs without SATA drivers, Ubuntu of course comes with all the drivers and works perfectly in SATA mode.
Once the SATA issue was resolved this also fixed my problem with my ATI Radeon HD2400 graphics card - some sort of IRQ conflict.
