I confirm, after a clean install again, everything is working, I think this was an Nvidia driver bug not gnome gdm3, as follows my system configuration:
ubuntu gnome 16.04 Kernel: 4.4.0-22-generic nvidia driver: 367.18 installed from ppa:graphics-drivers/ppa my gpu is: GeForce GT 740M running on HP ENVY Laptop Every thing is working fine, thank you all for your support -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1559576 Title: Ubuntu GNOME boots to black screen when using proprietary Nvidia drivers on a laptop with Optimus To manage notifications about this bug go to: https://bugs.launchpad.net/gdm/+bug/1559576/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
