I have a situation with nvidia where the system refuses to put up the login screen unless I boot into recovery mode, drop into root, do nothing other than continue with a normal boot.
When I don't do the initial boot into recovery mode, I get a tty login prompt or just a blank screen. ctrl-alt-f7 show a repeating failure to start the nvidia persistence daemon.
If I first boot to recover mode then continue with the normal boot. I don't see the nvidia failure.
I am wondering what it is about the recovery mode that makes the next normal boot come up differently.
This is the 16.04 system on a Lenovo P50.