Install PostgreSQL in Ubuntu (VirtualBox)

Download and Install PostgresSQL

Open your browser and navigate to http://postgresql.org. Here you can download the latest .bin file (e.g. postgresql-8.3.5.1-linux.bin)

Now install the image by opening a Terminal session and entering the following:

cd Desktop
chmod 755 postgresql-8.3.5.1-linux.bin
sudo ./postgresql-8.3.5.1-linux.bin

run with the defaults - so leave the installation directory as the default /opt/PostgreSQL/8.3 and the port as the default port 5432.
When prompted, agree to launch stackbuilder and from the popup window
select PostgresSQL on default port 5432 as the instance to work with.

Now select JDBC database drivers and click next. Leave the temporary folder as the default of /tmp folder.

The jdbc drivers will be installed into /opt/PostgresSQL/pgJDBC