Visit the Ubuntu Touch Wiki pagehereto know whether your smartphone/tablet supports Ubuntu Touch.
But with the current Ubuntu Touch Beta version, it is much easier to install it.
Only try this if you have a spare smartphone or tablet that you dont rely on.
once you nail understood the risks involved, you’re free to proceed with the tutorial.
First and foremost, download and load the official Ubuntu Dual Boot App on your Android smartphone.
You have now installed Ubuntu Touch on your Android smartphone/tablet with dual boot.
source: www.techworm.net