There are tons of informations missing. For example the version you want to install, or if you want to install for a development or deployment environment.
In any case ubuntu is not a certified platform; that doesn't mean it is impossible just it isn't certified. You most certainly will find informations on google as well.
You still didn't tell us if you plan to install a development or a deployment (an application server) environment. If you plan to install a deployment environment I would highly advise against ubuntu. Not because there are know issues (at least not to me) but because as already said: it isn't certified, and the certifications are there for a reason.
For development or pure curiosity I guess you can go ahead and knock yourself out.
I didn't find a installation guide solely for linux, so you might go ahead and find it yourself in the installation guide: Oracle&reg; Fusion Middleware Installation Guide for Oracle Forms and Reports 11g Release 2 (11.1.2) - Contents
if you met all the prerequisites then you might as well run the installer with the
Installing Oracle 10g on Ubuntu is an easy task bcz Oracle has created a Debian and Ubuntu package repositories. so we can install it using apt-get and aptitude.
Add the following lines to the /etc/apt/sources.list
# Oracle Repository
deb http://oss.oracle.com/debian unstable main non-free
import the key
wget http://oss.oracle.com/el4/RPM-GPG-KEY-oracle -O- | sudo apt-key add -
Update the package repository database by using the following command:
sudo apt-get update
Install the Oracle Express packages:
sudo aptitude install oracle-xe oracle-xe-client
Configure the oracle as per ur need
sudo /etc/init.d/oracle-xe configure
Access the nice Oracle web interface by: