SO it's technically possible to use Ubuntu on a tablet. It can even be nice once you get used to it.
But the defaults are simply AWFUL.
First issue, you can't scroll in an intuitive way. Swiping up and down in Firefox doesn't make the page scroll - it highlights text.
To fix this add MOZ_USE_XINPUT2=1
to /etc/environment
In Firefox go to Customize and make sure that Density is set to Touch and disable the Title bar (uses a lot of screen space)
It's useful to configure it the way you want it to be.
The default on screen keyboard may be unreliable. Install "onboard" and you'll have a more advanced on-screen keyboard that you can configure to your liking.
Doesn't scroll with swipes.