else
URLS=" \
- http://cloud-images.ubuntu.com/precise/current/precise-server-cloudimg-amd64-disk1.img \
http://cloud-images.ubuntu.com/trusty/current/trusty-server-cloudimg-amd64-disk1.img \
http://cloud-images.ubuntu.com/xenial/current/xenial-server-cloudimg-amd64-disk1.img \
http://mirror.catn.com/pub/catn/images/qcow2/centos6.4-x86_64-gold-master.img \