Im not recomment to install ubuntu touch .
below is EXTRA bug did not say in this website :
https://wiki.ubuntu.com/Touch/Devices/minato
note all bug I did found.Ubuntu touch is install on C6902 (come from latest stock).
-Touchscreen in ubuntu touch not working
-locked screen is not work properly (backlight still lit).
-power off charging is buggy .screen still lit after battery icon gone and when disconnect USB it stuck at blank screen (backlight lit).need to hold power and Vol up to reset .
-when in ubuntu if power off while screen is on and USB connected .the screen will blank and baklight still lit untill you reset. (Dont ask me how I can power off.I use mouse with OTG .)
-OTG not support for some USB hub .(one of mine working in android but not in ubuntu).
-another bug @
https://wiki.ubuntu.com/Touch/Devices/minato