Fedora core is not supported currently, I'm guessing nobody is going to report here that they've got it going.
Ubuntu Linux --> not in any plans I have seen. If you have access to a supported OS (late RH or SuSE released distributions), you could always try installing a GUI on the supported OS, and installing a linux remote agent (vtserver) on the Ubuntu, depending on kernel. (It's not in the supported list for vtserver, but, until you tried, you wouldn't know for sure. Might be a quick way to get some profiling info.)