I have Ubuntu 15.04 and GNOME 3.16 installed.This PPAs are enabled:deb http://ppa.launchpad.net/gnome3-team/gnome3-staging/ubuntu vivid maindeb http://ppa.launchpad.net/gnome3-team/gnome3/ubuntu vivid mainInterestingly, GDM runs in TTY1 and TTY7. Is there a way to fix this? I would like that GDM runs only in TTY7.
Why does GDM start in TTY2 and TTY7
ubuntu;gnome3;tty;gdm3
Based on this response, I have done the following and it works.sudo nano /etc/gdm/gdm.confIn this file, I added the following line.FirstVT=7In /etc/gdm/gdm.conf you can set what the 1st terminal should be the  graphical interface. FirstVT=7 will make GDM check tty7 first (by  the way: this could mean it ends up on tty8, tty9 if these are enabled  and tty7 is not free.If this is inactive in /etc/gdm/gdm.conf it will probably randomly  start with tty1 and if that is active (ie. a terminal session is open)  it will pick tty2 and so on.Source