Trying out the almost ready Ubuntu focal from the images: repo brings immediately a new and shiny problem:
sudo: setrlimit(RLIMIT_CORE): Operation not permitted
with an Ubuntu host (16.04 or 18.04)
while sudo actually works, it’s a scary message. it’s a known problem and there is a new version of sudo to fix it.
My 0.000002 €: if the first official Ubuntu 20.04 don’t include sudo 1.8.31-p1-1 it would be better to wait for this feature to be fixed before promoting 20.04 to the ubuntu repo. Sudo is a basic feature really.