Nested KVM Using VirtualBox Inside a Linuxmint Unraid VM


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So I have a setup running smoothly previously, but suddenly broke . 

 

I'm not sure what went wrong, maybe it's a BIOS setting or Unraid config that I changed. 

 

But to be honest, I've tried running a Linuxmint 20 VM inside of Linuxmint Unraid VM using VirtualBox, and ran smoothly for the past couple months. I don't used it often, but as far as I can remember, it had worked.

 

Then this week, tried to run the VirtualBox again, and gone through issues with the VBox VM. I see errors and the VM won't boot up at all.

 

Can anyone help and advise where to look on? Could CPU pinning on Unraid Setting may affect VirtualBox? I think that is the last setting I changed.

 

Screenshot of the VirtualBox VM booting up:
bauhYe.jpg

vVp7ms.jpg

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