The beauty of Android is that it allows users the flexibility to tweak things to the extent that their devices can run other operating-systems. Ubuntu Dual Boot Installer takes advantage of this and has now released an app allowing users to run Ubuntu and Android on a single device as a dual-boot system. A user can install and use fully functional Android and Ubuntu images and switch between them easily, on each-side, an app with a simple user interface enables them to boot back and forth at the tap of a button.

Instructions on how to install @ https://wiki.ubuntu.com/Touch/DualBootInstallation