I decided to make an thread about ABM, an project I develop together with Luka Panio.
If you wonder, "what is ABM?":
An multiboot to have Volla OS on the internal storage and Ubuntu Touch and Sailfish on the external SD card on one device!
It still is in Beta, but it works great in combination with Ubuntu Touch
Here is an link to our website:
https://abmanager.tech
The Wiki has lots of helpful information.