Linux system with Virtualbox for install testing.
Run build-and-run which will download some extra dependencies, build image and start
a Virtualbox machine to test the install process.
Assuming usb stick is /dev/sdc and the pre-built image name is install.iso:
sudo dd bs=1M if=install.iso of=/dev/sdc
Note that Ubuntu has two install methods:
- Ubiquity installer (which is a fairly limited install from a pre-built complete system image).
- Network install using Debian Installer.
This customized installer is the "Debian installer" flavour. Best place for documentation is Debian docs.