https://linux.how2shout.com/how-to-install-qemu-kvm-and-virt-manager-gui-on-ubuntu-20-04-lts/
How to install Qemu/KVM and Virt-Manager GUI on Ubuntu 20.04 LTS
Feb 26, 2021 - Learn the commands to install Qemu or KVM on Ubuntu 20.04 or 18.04 Linux with GUI Virt-Manager to manage virtual machines graphically.
qemu kvmvirt managerinstall
https://blog.wikichoon.com/2014/12/virt-manager-10-creates-qcow2-images.html
virt-manager 1.0 creates qcow2 images that don't work on RHEL6 | Cole Robinson
virt managercreatesimages