I got the GNURoot Debian Launch X option to "work", but it was so clumsy as to be worthless. So I use the nonX11 shell of GNURoot Debian, and display X11 stuff, when needed, with XServer XSDL (another app entirely). The combination is usable, but no where near as handy as an N900. I should clarify that when I said GNURoot Debian drained the battery, even when Idle, it doesn't drain it rapidly. When idle, it seems to take about as much juice as "Google Play Services" (on a Nexus 5x). I'm just surprised that it burns power at all when I am not actively using it. I use iPython as my calculator, and I have lots of functions defined. With my N900, I can just leave an iPython shell running all the time, and it does not drain the battery at all.