Canonical has released an Ubuntu and Android dual boot preview for developers. This lets developers test the ability to easily boot back and forth between Android and Ubuntu on mobile devices.
We are thrilled to announce a preview of a new feature for developers: Ubuntu on mobile devices can now run alongside Android on a single handset.
Dual boot is not a feature suitable for regular users. It is recommended to be installed only by developers who are comfortable with flashing devices and with their partition layout. Dual boot rewrites the Android recovery partition and those installing it should be intimately familiar with re-flashing it in case something goes wrong.