Re: Vista Headaches.
Mac OS does the same sort of thing: If you boot from a Mac OS CD, as well as installing Mac OS, it stops the computer from going into Yaboot by default. Fortunately, you can always go into Open Firmware and type:
where x is the partition number of the bootloader. Then once you're in Ubuntu, you can just type ybin and off you go again.
I try to treat the cause, not the symptom. I avoid the terminal in instructions, unless it's easier or necessary. My instructions will work within the Ubuntu system, instead of breaking or subverting it. Those are the three guarantees to the helpee.