@ChrisW67, no the problem is with the system wide install, by random user X, installing my program for anyone.

I am considering (I might not have a choice) not installing my program as a system wide application, to avoid all the mess as you mentioned. What remains on the table is the HOW TO elevate user privileges on Linux Distro's in a proper manner using a GUI with QProcess. It has degraded from must implement to the "I MUST KNOW HOW" feeling. So I cross-posted my question on a Linux Forum where they suggested I'd write a make script to handle elevations for the worker process (B) - leaving the GUI out of it. But that defies the purpose of my installer. I will find out how to do this eventually. In the mean time I thank you all for supporting this topic.