I would like to open the terminal from the login screen. In previous Ubuntu releases I just used Ctrl+Alt+F1. However, when I press Ctrl+Alt+F1 in 18.04, nothing happens, the login screen just stays as it is. All other combinations with F-keys (F2 to F12) also have no effect whatsoever.
What key shortcut do I have to press to open the terminal from the login screen?