Tested ANSYS CFX (CFX-Pre, CFX Solver Manager, CFD-Post) versions 11.0 SP1 and 12.0.1 on Ubuntu 9.04 (32-bit and 64-bit), and everything looks like it runs fine.

(The CFX GUI uses Qt toolkit, which is also used for KDE.)

Please note that  Ubuntu is not an officially supported distro for CFX.