How to build an “orignal” Ubuntu installer/live iso image?

Question

Where to I find the scripts to bootstrap and create an normal Ubuntu installer/live iso image?

Or in other words, how are the (X)Ubuntu default installer/live images build?

Answer 1

To do this, make a custom live CD from scratch. This article in the Ubuntu community documentation explains how.

However, you might prefer to start out with an existing live CD image, and customize that (which is considerably faster and simpler).