The tablet isn't working at all. It's got power (the light is on and it
brightens when the pen touches the tablet) but that's as far as it goes
- it has no effect on the screen.

I can wipe home because there's nothing in it, this is a test machine
(somewhat complicated by the fact that it's old and rather unstable).

But I just got the new installation to boot, and still no tablet action.
About to have a look in Synaptic and see what's what with the drivers.