I am using ubuntu 16.04, and the server itself keeps coming up showing aborted in less than 24 hours in virtualbox. I searched the error on the virtualbox support tracker and found a matching bug... no fix yet. It's specific to the vb version and ubu 16.04. I tried untarring the ova and qemu converting the disks to qcow2 or raw. neither will yeild a successful boot. any ideas. i have tried building the machines as raw disk, vmdk read only and qcow2.. none will boot. anyone else tried this or had a similar result trying something else?