I was trying to use Ubuntu 16.04 cloud image xenial-server-cloudimg-amd64-disk1.vmdk [downloaded from https://cloud-images.ubuntu.com/xenial/current/ ] on VirtualBox but facing two problems:
Booting the VM stops indefinitely following the message "...random: nonblocking pool is initialized ". The same VM image on Vmware workstation takes to the the 'ubuntu login' successfully.
Since the cloud image doesn't have ubuntu password, I tried to pass this with "init=/usr/lib/cloud-init/uncloud-init ds=nocloud ubuntu-pass=ubuntu" as described in https://help.ubuntu.com/community/UEC/Images/KVMKernelOptions, but it doesn't seem to work as the login doesn't accept the password.
Thanks for any help regarding the issues.