[Rails] configure create database virtual rails

I have installed virtual machine and virtual rails on my laptop using
Linux mint. Im learning as I go. Everything I need comes with this
package :

MySQL
Mongrel
Ruby1.8.7
Mongo D.B.
Git 1.6.3.3
Netbeans 6.8

so before I can run a rails application according to the tutorial I
need to configure a database and create a database. Is this correct??
I tried apt-get install and gem install and they did not
work...

if configuring and creating a database is the next step how do I go
about doing this?

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