Beware of upgrading to the latest Ubuntu/Kubuntu distribution (9.04 "Jaunty Jackalope") if you use a tablet or have an intel based graphics chip. The latest release includes some significant upgrades to the X server and if you're on the wrong system you're more likely to come out thinking it should have been called Jaundiced Jackalope. X.org is undergoing a transition to hot-pluggable HAL controlled input devices and away from the static configuration in xorg.conf. Read more »