qemu qcow2版本不兼容问题

现象ide0-hd0 uses a qcow2 feature which is not supported by this qemu version: QCOW version 3解决方法降低版本qemu-img amend -f qcow2 -o compat0.10 ubuntu-server-1404.img升高版本qemu-img amend -f qcow2 -o compat1.1 ubuntu-server-1404.img