Ubuntu OS に KVM 環境を構築

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 systemctl status libvirtd

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

sudo apt install -y cockpit
sudo systemctl start cockpit.socket
sudo systemctl enable --now cockpit.socket
sudo systemctl status cockpit.socket

sudo vi /etc/netplan/01-custom-config.yaml

network:
  renderer: NetworkManager
  version: 2

sudo chmod 600 /etc/netplan/01-custom-config.yaml
sudo netplan generate
 
sudo systemctl restart NetworkManager
sudo systemctl status NetworkManager

sudo systemctl status systemd-networkd-wait-online
sudo systemctl stop systemd-networkd-wait-online.service
sudo systemctl disable systemd-networkd-wait-online.service
sudo systemctl mask systemd-networkd-wait-online.service

sudo apt install -y cockpit-machines