Edit the file /etc/apt/sources.list and add the repository for Oracle install
sudo vi /etc/apt/sources.list
deb http://oss.oracle.com/debian unstable main non-free
Update system
sudo aptitude update
Install Oracle
sudo aptitude install oracle-xe
Configure Database
sudo /etc/init.d/oracle-xe configure
Press ENTER for default ports
Type System user password
Wait database starting
For access Enterprise Manager type in your browser
http://SERVIDOR:8080/apex