Hi Gert
You need an up-to-date linux distro to run PI. Specially, you need the latest version of glibc (well, at least the previous one). Fedora and Ubuntu are usually updated regulary, and up to date. Sometimes Fedora is a little ahead, and some compability problems may arise with a module compiled with the latest FC release and other linux distros.
Anyway, try upgrading SLC. Also, as Georg said, pay attention to the PI version you downloaded. It should match the bits of your OS.