install apt-get package to qcow2 image

install package to qcow image.sh

sudo apt-get install qemu-utils
sudo modprobe nbd

sudo qemu-nbd --connect=/dev/nbd0 /full/path/to/qcow2/image/file

sudo mkdir /mnt/ubuntu

sudo mount /dev/nbd0p1 /mnt/ubuntu

sudo mount -t proc proc /mnt/ubuntu/proc/
sudo mkdir /mnt/ubuntu/run/resolvconf
sudo cp /etc/resolv.conf //mnt/ubuntu/run/resolvconf/

sudo chroot /mnt/ubuntu apt-get update
sudo chroot /mnt/ubuntu apt-get install foo -y

sudo umount /mnt/ubuntu/proc

sync

sudo umount /mnt/ubuntu
sudo qemu-nbd --disconnect /dev/nbd0