JR> Yes, those are the "certified" Linux releases, but Oracle versions prior to JR> 10g could be installed on other distros. The screenshots seem to indicate JR> that the Installer now checks which Linux you're running, which leads me JR> back to the original question. I haven't tried it myself, but Wim Coekaerts once mentioned an "-ignoreSysPrereqs" installer option that would get you past that Linux distribution check.
Or suggested by DJ: edit the oraparam.ini file and edit the supported versions section.
Or: run
runInstaller --help
and actually read it :-)