Further info: I updated my main computer to 18.04. That one has Nvidia
graphics (updated to the latest nvidia-390 from PPA). Behaviour is
different, but buggy, too, as follows:

1. boot
2. Hit ctrl+alt+f3. Console shows. Log in. exit (log out).
Expected behaviour: return to gdm's graphical login screen with responsive 
keyboard and mouse.
Actual behaviour: the gdm's screen appears but keyboard and mouse are 
unresponsive... 
3. Hit ctrl+alt+f1. 
Expected behaviour: even if ttt3's screen seems corrupted, hopefully 
ctrl+alt+f1 would return to gdm's graphical login screen with responsive 
keyboard and mouse on tty1.
Actual behaviour: screen blanks. Computer is unrecoverable from keyboard and 
mouse. Only REISUB can reboot it again (alternatively, accessing it via SSH 
shows that the OS is still alive and well, but graphics are messed up).

In summary, both Intel and Nvidia behaviours, in two different
computers, seem buggy, although the actual behaviour is slightly
different for each case.

A bold conjecture: does GDM use Wayland or X? Is this caused by any
Wayland/X switching?

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https://bugs.launchpad.net/bugs/1758512

Title:
  No virtual terminals (CTRL+ALT+F?) when no user logged in; erratic
  behaviour when user logged in.

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