I also am facing the same issue and also boot to tty1. I'd be happy to
provide any further information to help solve this.
P.S. If it is of any use, this also happened when I tried installing
nvidia drivers on a new Fedora 23 installation.
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** Attachment added: "Xorg.0.log with the problem (nvidia-340 340.96-0ubuntu3)"
https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-340/+bug/1571225/+attachment/4638366/+files/Xorg.0.log
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Bugs, which is subs