How to switch virtual console on Ubuntu inside VirtualBox

I sometimes run Ubuntu inside a VirtualBox virtual machine. In this Ubuntu, to switch from graphical window manager to the first virtual console, press Host + F1. By default, the Host key in VirtualBox is assigned to Right Ctrl key. So, I press Right Ctrl + F1. To get back to graphical window manager, switch to the 7th virtual console: Right Ctrl + F7.

Tried with: VirtualBox 4.3.20