Ubuntu and Android dual boot preview has been released by Canonical. This enables developers to switch between Ubuntu and Android on mobile devices.
From the official announcement:
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.
For developers only
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.
Multiple Android flavours are supported (AOSP or stock, CyanogenMod) and installation of Ubuntu can be done for all versions available in the phablet-flash channels.
Easy OS switch via apps
With dual boot, switching between OSs had never been easier. No more key combinations or command line interfaces to jump into the next OS: on each side, an app with a simple user interface will enable you to boot back and forth at the tap of a button.
If you are a developer read more on how to install here
Credits: Ubuntu Developer