There are so many links you can visit to installing Oracle XE over internet or you can even ask google, but at this posting I would to share my experience how to install Oracle XE using ubuntu Intrepid Ibex, my own console.
First of all, you should provide your public key by generate it using pgp. Simple step of making it you can go to this link: http://ubuntuforums.org/showthread.php?t=37086, thanks to Kassetra to provide useful information :). After generating your public key, you can see your key on Application > Accessories > Passwords and Encryption Keys to make sure that your key is available. Go to http://pgp.mit.edu to add your key on the server and check whether your key is saved properly.
Open terminal, then get the Oracle public key using this command:
wget http://oss.oracle.com/el4/RPM-GPG-KEY-oracle
sudo apt-key add RPM-GPG-KEY-oracle
Once again, make sure that the Oracle public key is installed well on your box by opening “Passwords and Encryption Keys”. Go to Other collected keys tab.
Add this line to your /etc/apt/sources.list using your favourite editor.
# Oracle Repository
deb http://oss.oracle.com/debian unstable main non-free
Save, and exit. Then update the package repository database
sudo apt-get update
Now install the Oracle Express packages, include Oracle Express itself and the client
sudo aptitude install oracle-xe oracle-xe-client
Above command will install these software
- libaio
- oracle-xe-client
- oracle-xe
- oracle-xe-universal
It may take several times, about 1 hours depends on you internet connections.
After all, you have to configure your XE
sudo /etc/init.d/oracle-xe configure
And the final step, you can see your XE in action by opening your fave browser and goto
http://127.0.0.1:8080/apex

Reference:
- http://mediakey.dk/~cc/ubuntu-howto-install-oracle/
- http://ubuntuforums.org/showthread.php?t=37086
- http://ubuntuforums.org/showthread.php?t=361809
- http://www.oracle.com/technology/tech/linux/install/xe-on-kubuntu.html






