using a virtual box ...

On the Clone-VM:

You need to configure the current system so it is more secure because it will be located in a public area. Configure the GRUB boot so the following features are enabled:

The GRUB menu should not appear. Instead, the default image should be automatically booted.

Create a superuser GRUB account named super with the encrypted password noaccess.

Create a regular GRUB account named user with the encrypted password secured.