I was not able to do a serial console install (virt-install) of ubuntu 24.04 server, but I was able to install it via virt-manager after installing a gui to my kvm host. Afterwards I ran the two commands on the ubuntu vm shown by KoncWW, and then I was at least able to virsh console into the vm.
I also couldn't get debian to install with the "DVD" iso using virt-install. BUT, it did work with the "netinst" debian iso.