Ubuntu Phone is software developed for mobile devices by Canonical, the company behind the popular Ubuntu Linux Operating system. Ubuntu Phone is a relatively new effort and currently runs on a very limited set of hardware. However, the software behind Ubuntu Phone is open source and porting to alternate platforms is encouraged. This research paper will explore some of the internals of the Ubuntu Phone Operating system and will discuss a port to a Samsung Galaxy S4 phone.
http://krowv.net/papers/AnAttemptAtPortingUbuntuPhonetoaSamsungGalaxyS4.pdf