Re: Jaunty won't boot, i will die!!!!
You shouldn't jump from 8.04 to 9.04, bypassing 8.10 in the process. And as far as I know, I don't think you can go back to hardy again once you have upgraded your machine to Jaunty. One thing you could do is to boot your machine with Ubuntu LiveCD. Then mount the partition(s) where you want to save your personal files and copy them to a second CD/DVD drive or an external drive. Once you've done that, you can reinstall either hardy or jaunty again.
In the world of Linux, who needs Windows and Gates...
Got most of my golden beans at an auction on eBay (with a couple of free drinks).