Hi Walt,
I'm glad you got it working with WSL! If there are any extra steps you had to take, we'd love to know about them. Any suggestions for improving the install/build process are welcome; with the caveat that they may or may not be implemented. (We're mostly on *nix for OpenCoarrays development and there are a diverse set of windows *nix emulation and compatibility options out there from WSL, Cygwin, MSYS2, MinGW, etc etc.)
I'm curious, are you using MPICH from WSL/Ubuntu?
Thanks,
Zaak