Linux for the cashier. How to remove everything unnecessary from the shell (DE) so that only the browser remains?

Question

linux

Good day.
The task is as follows:
There will be a workstation, a pre-installed distribution kit, let's say Ubuntu. A person will sit behind it and process orders through a webCRM system, from the necessary - this is a browser and access to a printer.
Actually everything. Access to the rest should be blocked: no combinations, hot keys, calling the terminal, and even not being able to dig into the browser settings. A kind of qiwi terminal out of the box.
PS if someone has been to TechnoPoint stores, then he has seen a similar system. Here you need to set everything up in this way.
Thanks in advance for your replies.

Answer 1

Look for creating an information kiosk on debian/ubuntu. A bunch of them.

Answer 2

porteus-kiosk.org