It's possible to install a complete GNU/Linux software stack on Android devices, e.g. by adding a chroot environment as others already have implemented. This kit does 2 things differently: Firstly, it installs a Debian file system side-by-side to the Android file system. In order to access anything that’s accessible from Android also from the Debian side. And secondly, the Debian bootstrap is executed on the Device itself without any help of a larger PC, Android debugging bridge or similar.
Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.Download F-Droid