Virtualbox: 'Enable Nested VT-x/AMD-V' greyed and unable to change

sachin

On my Debian 12, I've installed VirtualBox 7.0 in order to install ProxMox to setup a home lab.

However, When I open the settings of my virtual machine and go to System -> Processor, the option "Enable Nested VT-x/AMD-V" is greyed out and I cannot enable it.
Note:

Virtualization is enabled in my bios.
The Virtual machine's status is currently off.

sachin

It is required to have Virtualzation enabled in the BIOS but as it is already mentioned that it is enabled.

Follow the steps to enable it:

Open Terminal and go to directory where your VM is installed.

cd /home/sachin/VirtualBox\ VMs/

Execute the following command to Enable Nested VT-x/AMD-V"

# Syntax:
# VBoxManage modifyvm you-mv-name --nested-hw-virt on
# Example:
VBoxManage modifyvm proxmox-host-1 --nested-hw-virt on

You can follow these documentation for more:

https://www.virtualbox.org/manual/ch03.html
https://www.virtualbox.org/manual/ch08.html#vboxmanage-modifyvm You are looking for "nested-hw-virt"