Success at last! It is apparently very import to unlock at "latest android". I unlocked at Android 6.
I installed twrp like this:

sudo fastboot flash boot boot.img

It will then always boot into twrp, but I didn't manage to flashing it to the recovery area to work.
Once booted into twrp, I had to format system, data & cache since the phone got encrypted by default.

Btw, ip configurtion from console:

sudo ip addr add 10.15.19.1/24 dev -your device- 

For those of us that don't have a fancy GUI to help you with.

ubports on xperia x feels a bit sluggish compared to the nexus 5. A look at top, shows that unity8 consumes quite a lot of cpu when doing some ui interaction. I suspect no hw acceleration enabled?

edit: Some language corrections.

Good initiative! Maybe include on each game engine how well they preform on Ubuntu Touch, things that are not working that good etc?

@stefano Thanks! running adb with sudo did the trick! Strangely, I've not had to do that with android phones.

I've been playing around from time to time with Ubuntu Touch on the Xperia X. Over all it works very well, but a few things that are not really working (and not mentioned not to work above):

• Vibrator
• GPS
• Of the sensors, only accelerometer works
• A fully charged battery is reported to be at 67%.
• After pressing the power, it takes a few seconds before I can unlock it. Maybe related to the lack of graphic hw acceleration?

Thanks! I'll do that.