The Github page containing the all-snap Ubuntu Desktop mentions using
This directory contains an image of Ubuntu Core 22 with the GDM display manager loaded into the boot file system. It can be launched in a Qemu virtual machine by following these instructions:
Download and decompress the two image files and place them in the same directory.
Add an image as a VM launchable from GNOME Boxes or virt-manager:
Shouldn’t using an LXD VM work as well?
Its not mentioned.