CrossOver Games 8.0.0 Linux
Ubuntu Studio 8.04 64-bit
XnView 1.96.5
Installer works well. XnView also runs well, as tested: browsing around the hard drive, GUI tweaking (panels resizing etc.), viewing images, full-screen viewing (this was a good surprise), colours adjustments, batch conversion of many files.
There is one minor issue I found: XnView has a tabbed GUI. When you move your mouse cursor over the tabs, the tabs' text disappears (I've grabbed and submitted a screenshot with this quirk). But it's not a showstopper because on some subsequent actions the text is redrawn.
Considering it can be used on a regular basis with just this minor annoyance, I'm giving it gold medal.