this applies to:

VirtualBox Version 5.1.8 r111374 (Qt5.3.2)

 hostnamectl 
   Static hostname: DebianWorkstation
  Operating System: Debian GNU/Linux 8 (jessie)
            Kernel: Linux 3.16.0-4-686-pae
      Architecture: x86

the VMs hangs on startup with this screen:

Solution:

kill the vm

then disable audio device…

the VM should not startup normally… weird 😀

does somebody know the deeper cause?

admin