Enable Ctrl+Alt+F1 Virtual Consoles in GNOME (Ubuntu 17.04+)
In previous versions of Ubuntu, Ctrl+Alt+F1 through F6 opened up virtual consoles. On Ubuntu Gnome 17.04 Ctrl+Alt+F1 opens another GUI and the others do nothing.
How do I restore the old behavior?
I'm running Kubuntu v16.04 - not the version that you are - but I had to modify /etc/systemd/logind.conf, uncomment NAutoVTs=6 and restart.
Also, check /etc/default/console-setup, the line: ACTIVE_CONSOLES="/dev/tty[1-6]"