@phiibuntu Hi all, I got this working today, it turned out to be quite simple. Now, I am unsure of all the caveats, but this is what I did and it worked after not behaving for a long time:

1. Turn location on

2. Go to system settings > security & privacy > locking amd unlocking > lock when idle: Never

3. Get the SensorStatus app

4. Set it to never suspend with the UT Tweak tool app

5. Reboot

6. Open sensosstatus app, go to GPS

7. Leave next to the window for some time (it wasnt excessively long, but i also wasnt paying attention). I think the point is to stay still.

8. After some time it got a lock and started reporting my location! Unav and whatever else works now!

So are all these steps necessary? Idunno. But its what i did and it worked! Hope this helps!

Cheers

@Phiibuntu so in the end all i did was

sudo -s
mount -o remount,rw /
apt install waydroid
waydroid init
reboot
sudo -s
waydroid container start
exit

And after that I had a happy Xiaomi UT20