There’s been a spin of Ubuntu that runs on the Pi for a good while now - usually with the MATE desktop - and it’s always worked a treat. The latest development is that Canonical wants to bump up its solid support for the Pi with an official desktop release, possibly with Ubuntu 20.10. This information comes from hints dropped in a regular Canonical dev podcast. See https://bit.ly/lxf265ubuntu for more details.
With strong industry use of the Pi, Canonical’s show of support for the device isn’t an unexpected move.