[MerelyMortal]

I'm not that technical and not sure what you mean by tainted kernel.

You can use VirtualBox with Secure Boot on a Dell XPS 9300 running Ubuntu. When you boot it up after installing, it prompts you to install the keys.

[FeistySkink]

I'd rather avoid this and this might not even be an option if your BIOS is locked down. But then we can get into why use VirtualBox at all argument.