sudo apt install -y cloud-image-utils

sudo chmod u+s /usr/lib/qemu/qemu-bridge-helper

sudo mkdir -p /etc/qemu/
echo "allow br0" | sudo tee /etc/qemu/bridge.conf
sudo chown root:root /etc/qemu/bridge.conf
sudo chmod 0644 /etc/qemu/bridge.conf

sudo systemctl restart libvirtd
systemctl status libvirtd --no-pager