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73416ba
(Get the code!)
Similarly to comment #74, I have exactly the same symptoms on a Samsung laptop with Intel HD4000 graphics (i.e. *no* nVidia or any other video card is/was present). Moreover, it's a fresh install of Ubuntu 16.10. It is also of note that I've never had this issue before on the same machine with any of previous versions of Ubuntu Gnome, including 16.04 LTS with gnome3 ppa enabled.
On 16.10, I just cannot properly start GDM3 at all. It shows the same black/dark grey background as has been mentioned and nothing else is going on. Also, going to TTY1 does not work -- one is unable to do anything on it; even CTRL-C does not work. Switching to TTY2, however, works fine. I've looked at various log files, but to be honest, I don't see any clues indicating what's the problem and where the process gets stuck.
It works just fine with LightDM, though.