@tkaiser, @Igor: Your answers, articles and blogs are very helpful! Many thanks!  Is the Orange Pi Zero Plus too new for a beginner like me (since I can't attach a monitor in a simple manner)? Or should I give it a try? No huge investment, except time    Currently I do prefer the option to install https://dl.armbian.com/orangepizeroplus/Debian_stretch_next_nightly.7z. It is my understanding that I have to put this at first on the mircoSD card properly, according to https://docs.arm