I have Virtualbox 4.1.20 in Ubuntu 12.04 32 Bit (With PAE) and I want to run Ubuntu Server 64 Bit on the Guest. Is this possible?. I ask since I get the following warning:

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I want to make sure that there is no option to "emulate" this. I have a 64 bit CPU that supports virtualization. The Intel DZ68DB motherboard with an Intel I7 2600 CPU.


1 Answer 1


Virtualbox supports running a 64-bit guest VM on a 32-bit physical host, but there are some requirements and other caveats:

From the manual:

VirtualBox supports 64-bit guest operating systems, even on 32-bit host operating systems, provided that the following conditions are met:

  • You need a 64-bit processor with hardware virtualization support (see the section called “Hardware vs. software virtualization”).

  • You must enable hardware virtualization for the particular VM for which you want 64-bit support; software virtualization is not supported for 64-bit VMs.

  • If you want to use 64-bit guest support on a 32-bit host operating system, you must also select a 64-bit operating system for the particular VM. Since supporting 64 bits on 32-bit hosts incurs additional overhead, VirtualBox only enables this support upon explicit request.

  • Warning:

  • On any host, you should enable the I/O APIC for virtual machines that you intend to use in 64-bit mode. This is especially true for 64-bit Windows VMs. See the section called “"Advanced" tab”. In addition, for 64-bit Windows guests, you should make sure that the VM uses the Intel networking device, since there is no 64-bit driver support for the AMD PCNet card; see the section called “Virtual networking hardware”.

  • You know what I forgot, the point about "you must also select a 64-bit operating system for the particular VM". I was reusing the 32 Bit Ubuntu. Thanks friend. Aug 27, 2012 at 0:33
  • "You need a 64-bit processor with hardware virtualization support" On the host? A 32-bit host with a 64-bit processor?
    – user12753
    Jan 9, 2016 at 23:29
  • @Alex 64-bit host hardware with a 32-bit host OS installed on it.
    – user253751
    Jul 27, 2016 at 7:27

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