I have installed fog over Ubuntu Server :
Distributor ID: Ubuntu
Description: Ubuntu 18.04.4 LTS
Release: 18.04
Codename: bionic
Hypervisor used: Virtual Box

my personal computer (Ubuntu 19.10)
Specs --> check t495

It is running okay I guess.

Can you advise me how to create netboot for the following OS Ubuntu 18.04 Desktop?

So, guys how can I create a network boot of Ubuntu 18.04 Desktop over Ubuntu 18.04 Server (fog here)
I get sorta the idea with the images but how to really create them also how to make my second vBox host recognize the netboot ??? virtual switch??? sort of a bridge??