They've worked on every system I've tried except my Toshiba 1805-S203
laptop. This is pretty well documented on the web for 7.10, but not
yet for 8.04. I found a web page that told how to do a 7.10 install
from an alternate install CD, and found that it was actually simpler
with 8.04. Still no live CD for me though. I've documented what I did
at:

http://www.buchanan1.net/xubuntu_on_toshiba.shtml

There is also a link there to the web page about 7.10 on this machine.

BTW, I used to be a ReHat/Fedors/CentOS user at work and home (I
worked as an HP/UX/Solaris/Linux admin). When I retired, I tried
Ubuntu at home, and haven't looked back. Even for an old CLI junky
like myself, it's just a better distro.