I just installed Ubuntu 9.04 Desktop on my MacBook Pro (Late 2007). When I use the MBP trackpad, the cursor moves very slowly, but when I plug in an external mouse, the cursor moves at a fine speed. I've tried adjusting the cursor speed in the preferences, but this doesn't help. Does anyone know how to fix this?

This Ubuntu forum's thread (http://ubuntuforums.org/showthread.php?t=436292) has a fix on the second page. You might would want to try that.