How to create a custom Ubuntu ISO with Cubic
If you're looking to build a custom Linux disk image that's based on Ubuntu, Cubic makes it easy. Here's what you need to know. If you are planning to roll out numerous Ubuntu-based servers, you can download the default ISO, install the operating system on each machine, and then install the necessary software.
https://www.techrepublic.com/article/how-to-create-a-custom-ubuntu-iso-with-cubic/