Xperience does not work under Ubuntu 9.10
maybe you need to install xbmc, too
I have installed XBMC camelot It works perfect with confluence
I'm pretty sure when you extract Xperience, it put's it in a subfolder - move all the files up to the top-level Xperience folder.
The folder structure should be
.xbmc\skin\Xperience (if there are no files directly in this folder, then that is your problem)