Francois, Replying to comment #20 gdm uses vt1 by default since Ubuntu 16.10 and the first user to log in will get the first available vt which should usually be vt2.
Francois, Replying to comment #20 gdm uses vt1 by default since Ubuntu 16.10 and the first user to log in will get the first available vt which should usually be vt2.