plan support ubuntu 20?
coin should be switched to RandomX?
If you know of a problem with Ubuntu 20 please report it. I think the readme may just need to be updated.
There is no plan to switch to RandomX.
I run git submodule update --init --force --remote --recursive
fatal: Needed a single revision
Unable to find current origin/monero revision in submodule path 'external/miniupnp'