Basically you need to create an Ubuntu custom distribution; that is not a simple thing but is not rocket science either, Ubuntu installs can be "preseeded " making the install completely unattended. If you want to network deliver the install you will need PXE support, this is not much of a deal as the Ubuntu Server distributions already include the initrd images required for PXE booting. If you analyze Jeoss as a Server distribution being able to be installed in headless servers (no keyboard/no monitor) it supports the whole install being controlled by a serial connection or by remote SSH sesion. Take a look at it sure will give you a good starting point for knowing what you can do when customizing Ubuntu's installs.