Qemu

sudo apt install -y qemu-kvm virt-manager libvirt-daemon-system virtinst libvirt-clients bridge-utils
sudo systemctl enable --now libvirtd
sudo systemctl start libvirtd

sudo usermod -aG libvirt $USER
sudo usermod -aG kvm $USER
newgrp libvirt
newgrp kvm

Knowledge

sudo apt install qemu-system
sudo apt install cpu-checker

sudo systemctl stop libvirtd.socket
sudo systemctl stop libvirtd.service

sudo systemctl status virtlogd.socket
sudo systemctl status virtlogd.service

qemu-system-i386 -net user -cdrom my_iso.iso
kvm-ok

qemu before start 
sudo systemctl stop    virtualbox.service
sudo systemctl disable virtualbox.service

sudo systemctl enable  virtlogd.socket
sudo systemctl start   virtlogd.service

sudo systemctl enable  libvirtd.service
sudo systemctl start   libvirtd.service

sudo systemctl enable  libvirt-guests.service 
sudo systemctl start   libvirt-guests.service

References

Vagrant vs. Terraform Vagrant vs. CLI Tools Vagrant vs. Docker Linux Containers Install Qemu About Qemu Terraform Podman Vagrant Docker	Vagrant fails to create box with libvirt Install KVM on Ubuntu 22.04 VirtualBox