I have installed VirtualBox inside of VirtualBox.
- Host OS: OS X Yosemite
- Guest OS: Ubuntu 12.04
- Both versions of VirtualBox: 4.3.28
The guest versions in VirtualBox installed on Ubuntu 12.04 are only 32-bit.
How can I make 64-bit available?
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At the present time VirtualBox does not officially support nested virtualization, even thought one can nest a 32-bit Guest a 64-bit guest cannot be nested as VT-x is not passed through to the nested Guest and it's one of the requirements to run a 64-bit Guest, nested or not.
VMware Fusion does support some nested 64-bit Guests although off the top of my head I'd have to check the documentation to be more specific. You can have a look Running Nested VMs at VMware's website.