It says that the guest is supposed to have some special software
That sounds like virtio-win. I usually use the iso and mount it from virt-manager, but if the internet is working then I guess you can download the exe.
I’m assuming that I’m supposed to download “libvirtd”
Just searched it up, something like this should work: sudo apt install qemu-kvm libvirt-clients libvirt-daemon-system bridge-utils virtinst libvirt-daemon
Sorry I don’t have too much experience with gnome boxes either, I mostly use virt-manager.