For some reason I thought task-gnome-desktop would automatically install gdm3, but perhaps not. The basic steps you want to take are:
1) Install the gdm3 graphical login manager. Use the following command:
Code:
apt-get install gdm3
2) Reboot to confirm you get to a graphical login prompt (that's gdm3).
3) Login to GNOME, and then go into the GNOME settings to configure gdm3 to auto login with the desired user. It has been a long time since I've done this since I switched to LightDM instead of gdm3. I don't remember exactly where I went. But it's definitely possible to do entirely within the GUI.