Mint or Ubuntu as a dual boot on a smartphone? It's totally different architecture. Phones and tablets are ARM, regular distros don't come built for ARM. There are videos of people getting Ubuntu working to some degree on a tablet but it's a million miles from just downloading, and burning an iso. Apart from the CPU, the UI is totally different, and touch / non-touch. If that wasn't enough, phones are not generic hardware. They are at the stage regular PC hardware used to be at, where every vendor is closed.