I just wanted to drop a line and let everyone know that ZS 4.0.1 works without issue on Ubuntu 9.04 "Jaunty Jantelope" 64bit without issue, I'm certain that it's the same with regard to the 32 bit editions. There were some minor issues with 8.10 "Intrepid Ibis" when that upgrade was still new but that seems to not be an issue this time around.
There seems to be some confusion :) ZS stands for both Zend Studio and Zend Server. The original message was related to Zend Server. Please post you're message here instead: viewforum.php?f=50