i had the same problem in ubuntu 18.04 after upgrading to nvidia-
drivers-390.48, than i could not login even using nouveau after removing
all nvidia driver.
GDM3 could not manage to boot properly but just installing lightdm and
setting it to default let me login successfully (i did not remove gdm so
it was not necessary to do so to fix it)
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Ubuntu 17.10 boots to black screen when using Nvidia drivers (on a
desktop with an Intel GPU)
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