It looks like the WSL tarball of Ubuntu 22.04 has been pulled from the Ubuntu release location. It no longer appears at https://cloud-images.ubuntu.com/releases/jammy/release/. Normally, in the past, it would have been ubuntu-22.04-server-cloudimg-amd64-wsl.rootfs.tar.gz.
I have a gist that helped show how to setup everything via PowerShell, which would include pulling down the WSL image, but it stopped working as expected for 22.04.
It looks like people can only do so now for 20.04, as that version of the *-wsl.rootfs.tar.gz is still available:
Anyone have details of why it was pulled, and if it now is meant to exist somewhere else? It was there previously, so the gist was helpful for people in getting things setup. I can update it with the new location if there is now some kind of dedicated location for it.