Can VirtualBox installed inside workstation

VirtualBox
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Can VirtualBox be installed on a workstation?

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Yes, but your hardware must be new,fast, and make sure nested virtualization is enabled.

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Note:

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On Windows Included VirtualBox on Windows with whonix Launches But on the second virtualbox, whonix does not start throws an error NS_ERROR_FAILURE (0x80004005

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Now virtualbox in virtualbox with 2 whonix Increases Attack Surface ?

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Did you read above links?