I had to install Oracle XE on a Fedora 11 machine, and had lots of trouble. This blog post:

http://remcodeblok.blogspot.com/2009/07/install-oracle-xe-on-fedora-11-x8664.html

provided the help to get it running. A couple of other things to note:

1) You have to install xterm. The rpm does not force that depdency for you.
2) If you do not have glibc installed, there is no visible error message. No log, and the rpm does not enfore the dependency.