Install lemonpos by entering the following commands in the terminal:
sudo apt update sudo apt install lemonpos
Description:
Open Source point of sale for Linux
This package is a configurable general point of sale, not focused to a specific sector. It can be used at a general store, a fast-food restaurant or a book store.
Homepage: http://lemonpos.sourceforge.net/
Version: 0.9.2-0ubuntu5
Section: universe/kde