Great question — answering as the UphillTech team:
The keyboard combinations to move to a different virtual console are Ctrl + Alt + Fx if you are in the graphical environment, and both Alt + Fx and Ctrl + Alt + Fx if you are in a text console. For example, if you are on the graphical desktop, you can move to virtual console 4 with Ctrl + Alt + F4 . Your graphical desktop runs on virtual console 2, so you can switch back with Alt + F2 . On Ubuntu, the login manager runs on virtual console 1, the graphical desktop on virtual console 2, and 3 to 7 are text consoles.
Full answer by vanadium: https://askubuntu.stackexchange.com/a/1567983 (CC BY-SA 4.0).
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