I would like to know what to be careful about using Ubuntu for commercial use. I am developing SW will run on ubuntu mate OS(Ubuntu 16.04.2 LTS). I am planning to sell my SW with ubuntu on SD card or with Raspberry PI HW. I have not modifying kernel but modifying config and cmdline files only. My SW run entire on C++, JAVA and using media player. Do I still need to buy licence for ubuntu mate ? or Do I have to publish my source code of my application publicly?
way I can see is, I am not selling Ubutu OS but I am selling my SW and HW which run ubuntu Mate OS. Unfortunately, I have to sell SD card with ubuntu mate OS and my application for pupil so cant install OS easily and lots of other sensor connected to device so not possible for end product. Is their anyone has used Ubutu mate for commercial purpose or any product in market?
Debian based product looks very straight forward explained here https://www.debian.org/doc/manuals/debian-faq/ch-redistrib.en.html I can use Raspbian OS for my use and there are couple of Pi products in market with this OS.