After installing Hardy Alpha2, I got 'fsck died with exit status 8' whenever I tried to boot any pre-existing linux partition on my machine. The source of the complaint was in trying to mount the new hardy partition. If this sounds like you, you might try this seemingly pointless yet effective method:
this opens a text editor
this kills the text editor, and magically sends you on your way to your desktop. wow.
Now you can go into etc/fstab and comment out the reference to the hardy partition. I did, and the partition booted normally upon restart.
Hope this helps.