I'm trying to set-up a `VirtualBox VM`, so that at the end of the process, an installation of Linux will start from the virtual DVD.  
 Alas, at the end of the set-up process I get an `NS_ERROR_FAILURE` error:

```
openstack@ubuntu:~$ VBoxManage createvm --name openstack101 --ostype Ubuntu_64 --register
Virtual machine 'openstack101' is created and registered.
UUID: 2a0fee1a-98c0-4f7d-9344-90eefcf75f05
Settings file: '/home/openstack/VirtualBox VMs/openstack101/openstack101.vbox'
openstack@ubuntu:~$ VBoxManage modifyvm openstack101 --memory 2048 --nic1 nat --nic2 hostonly --hostonlyadapter2 vboxnet0 --nic3 hostonly --hostonlyadapter3 vboxnet1
openstack@ubuntu:~$ VBoxManage modifyvm openstack101 --nic1 nat --natpf2 ssh,tcp,,4400,,22
openstack@ubuntu:~$ VBoxManage createhd --filename openstack101.vdi --size 204800
%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
Disk image created. UUID: 37e1ed19-8a3a-45b9-b0a3-a8af101ea165
openstack@ubuntu:~$ VBoxManage storagectl openstack101 --name "SATA Controller" --add sata --controller IntelAHCI --hostiocache on --bootable on
openstack@ubuntu:~$ VBoxManage storagectl openstack101 --name "IDE Controller" --add ide --controller PIIX4 --hostiocache on --bootable on
openstack@ubuntu:~$ VBoxManage storageattach openstack101 --storagectl "IDE Controller" --type dvddrive --port 1 --device 0 --medium ~/shared/images/ubuntu-12.04.5-desktop-amd64.iso
openstack@ubuntu:~$ VBoxManage modifyvm openstack101 --boot1 dvd
openstack@ubuntu:~$ VBoxManage modifyvm openstack101 --vrdemulticon on --vrdeport 3390
openstack@ubuntu:~$ VBoxManage startvm openstack101 --type gui
Waiting for VM "openstack101" to power on...
VBoxManage: error: The virtual machine 'openstack101' has terminated unexpectedly during startup with exit code 0
VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component Machine, interface IMachine, callee
openstack@ubuntu:~$

```

Googling for this error message suggests that instead of `VBoxManage startvm openstack101 --type gui,` one should use `VBoxManage startvm openstack101 --type headless.`

When I did that, I did receive:

```
openstack@ubuntu:~$ VBoxManage startvm openstack101 --type headless
Waiting for VM "openstack101" to power on...
VM "openstack101" has been successfully started.

```

But do not see any Ubuntu installation starting.  

Can you suggest what should I do differently - to succeed in installing a VM using VBoxManage commands?
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