Hi,
Check out the following link before you start with installation
http://www.dbspecialists.com/present..._on_linux.html
But as far as i have tried It was a 9i on redhat 3,0 system which
needed a preinstall patch from metalink.oracle.com but Oracle 10g ran
out of the box on a redhat 4.0 systems with basic memory and kernel tweakings.
Good Luck