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Installing FreeBSD 12.1 on VirtualBox (Windows 10 host) failed with Guru Mediation

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Installing FreeBSD 12.1 on VirtualBox 6.1.0 (Windows 10 host) failed with Guru Mediation.



As a workaround, from the command line, do:
c:\> "C:\Program Files\Oracle\VirtualBox\VBoxManage" modifyvm "FreeBSD" --spec-ctrl on

Reference:
https://forums.virtualbox.org/viewtopic.php?f=6&t=94390#p455778
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