Способ #1
https://ostechnix.com/how-to-enable-virsh-console-access-for-kvm-guests/ mht
В гостевой системе
systemctl enable serial-getty@ttyS0.service systemctl start serial-getty@ttyS0.service
Способ #2
https://askubuntu.com/questions/909617/libvirt-virsh-console-no-response mht