build-steps.d/2500_create-vbox-vm:
Added "|| true" behind "sudo -u "$USERNAME" VBoxManage modifyvm "$VMNAME" --draganddrop disabled || true"
|| true to make this work on Debian Wheezy. We do not yet have the requirement to build on Debian Jessi.
This VirtualBox feature was introduced first in the version which is also in Debian Jessi.