Ubuntu 18.04 bionic nvidia driver install failure

Bug #1752341 reported by Michinari Nukazawa on 2018-02-28
This bug affects 3 people
Affects Status Importance Assigned to Milestone
Ubuntu Japanese Kaizen Project

Bug Description

Ubuntu's login screen disappeared, so the message string written here is not accurate.

Hardware: Geforce1050Ti/AMD Ryzen 5 1600/4K & FullHD Display

# Phenomenon to occurrence
1. Introducing the cuda package
sudo apt install libcuda-1-384 libcufft-9.0 nvidia-cuda-toolkit
and when restarted,
- Only one of the dual displays can be used.
- You can not change the display resolution. (1024 x 768)

Devicce> Display in Ubuntu Preference to display type is "unknown".
(Before this was correctly recognizing the display name)

I noticed that the nvidia driver was not installed.
I decided to install nvidia-driver-390.
(On the day before yesterday's installation, it seems that it was installed automatically by installing cuda, but it is certainly my mind.)

# What I expected
Success installed nvidia driver & fix size 1024 x 768 and single unknown display.

# What happened
1. I suddenly logged out while installing the nvidia - driver package.
2. When I try to log in, login fails.
I get a message saying "Are you looking for a user?" (Japanese), not a password error.
3. Since it can not be helped, wait a few minutes and restart,
`` `
Started GNOME Display Manager. Dispatcher Service .... d before the ppp link was was shut down ....
`` `
Startup stops with the indication, Ubuntu login screen is not displayed forever.

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