The repo winehq was already added. It is https://dl.winehq.org/wine-builds/ubuntu/ with distribution focal and section(s) main.I got this too, with the 5.0 stable version that's in the Ubuntu repo. I'm pretty sure they have a bug (but I've not really investigated).
So I use Proton now. But if you add the WineHQ repo, their stable version might work (it did when I tested on 19.10).