@ThreeBadgersInATrenchcoat
Yeah, same experience with 20.0
I was installing it just to test, and it just failed repeatedly on creating a first user.
I even tried command line, that just hangs for eternity.
So I dig up 19.0.4, replace all the files and run the same command again. Guess what? Installs in 10 seconds.
Writing down for myself: never use .0 or .1 Nextcloud release.