For me this is still broken with -proposed packages although this bug
has "Fix Released" status: When I have xserver-xorg-video-nvidia-390
390.48-0ubuntu1 installed, the system boots into a back screen.
Without, LightDM comes up as expected.
lspci excerpt (on a ThinkPad T460p):
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 530 (rev 06)
02:00.0 3D controller: NVIDIA Corporation GM108M [GeForce 940MX] (rev a2)
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nvidia-390 fails to boot graphical display
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