Since Gutsy came out, I've reinstalled it entirely at least three times. My latest re-install just today because of boot failure Kernel Panic -- not syncing: No init found Try passing init=option to kernel: ...... What ever that means!
Interesting this occurred just after a Kernel Upgrade which from my days using Fedora, I learned to dread. Kernel Upgrades or changes seemingly always caused something to break.
I still love Ubuntu though but only because the other big OS is such a mess. At least with Ubuntu and Linux, I believe I have a fighting chance to figure out what went wrong and learn something along the way.