Following the instructions, I've added the https://cerebrate.github.io/wsl-translinux repo and updated (I get the notice about unsigned repo), but there's no wabash package:
$ apt-cache policy wabash
N: Unable to locate package wabash
Oops, looks like you found a typo in the instructions, now fixed. The package you need to install from the repo is wabashd, rather than wabash. Sorry 'bout that.
Following the instructions, I've added the https://cerebrate.github.io/wsl-translinux repo and updated (I get the notice about unsigned repo), but there's no wabash package: