GNURoot Debian is no longer being maintained and does not work on newer versions of Android. You want to use UserLAnd instead: https://play.google.com/store/apps/details?id=tech.ula
GNURoot Debian only remains for people with devices that are older than UserLAnd supports (below android 5.0) and to inform people of UserLAnd.
GNURoot Debian provides a method for you to install and use Debian and its associated applications/packages alongside Android.
This does NOT require root.
A regular uninstall fully cleans up after this application.
This is expandable and you will be able to install your own applciations/packages into it.
Inside GNURoot Debian, you can create a root file system, launch into it, or delete it.
The moto is: "This ain't done, until everything* will run"
*everything == all linux, user space applications, without having to root your device. Some things (a small number of things), that actually require root will not work (like inserting a kernel module).
Please: file bugs, feature requests of view code here: