The way that Ubuntu looks and works can be changed in many different ways.
Kubuntu users should see CustomizeKubuntu for instructions.
AutoLogin - Guide to set up automatic login if not set at installation.
Change your Time Zone - How to change the time zone on your computer.
Change the default OS - Instructions on how to change which operating system is started by default, if you have more than one installed.
Eye Candy - Information on changing the way that Ubuntu looks.
Local customizations - Install and configure features such as spelling dictionaries, based on your location.
Preferences - Brief descriptions of what the items in the System -> Preferences menu are for.
USplash Customization - Customize the boot splash screen.