[Bug 1765923] Re: Nvidia driver leads to black screen on bionic 18.04 SDDM LightDM bug?

[Hontas Farmer]

Installing GDM3 does lead to a system which will not boot to a black
screen.  Note you will need to change the desktop session to plasma to
get to kde.

For an experienced user used to the command prompt this is an annoyance.
I'd rather run a pure KDE kubuntu system.  To a newer or less technical
user having a black screen (not flashing cursor BLACK) is a show
stopper.

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https://bugs.launchpad.net/bugs/1765923

Title:
  Nvidia driver leads to black screen on bionic 18.04 SDDM LightDM bug?

Status in apt package in Ubuntu:
  New
Status in nvidia-graphics-drivers-390 package in Ubuntu:
  New
Status in sddm package in Ubuntu:
  New

Bug description:
  Using the April 19th daily build of Kubuntu 18.04 I installed the
  Nvidia drivers via the following command.

  sudo ubuntu-drivers autoinstall

  The install process proceeds fine and after a logout process I get a
  black screen.  I tried this on the April 17th daily build of bionic
  and a reboot also results in a black screen.

  The following is a question which was submitted by a Ubuntu 17.10 user: QUOTE
  After I installed latest Nvidia driver-390 and tried to boot after shutting down once I faced a black screen problem. since, I'm a noob but something related to nvidia drivers couldn't be started. Then I followed https://askubuntu.com/a/968692/802490
  While following these instructions re-installing of nvidia drivers failed. The only things that worked is purging the drivers and changing "WaylandEnable=false" in (/etc/gdm3/custom.conf). Now, I want to re-install nvidia drivers again but I'm afraid that this will lead to that problem again. Can anyone help in re-installing the driver such that I won't face that problem?  END QUOTE

  THE WORK AROUND

  Use Ctrl-Alt-f6 to get to a login prompt.
  Login
  run  "startx"

  The x server will start and Nvidia drivers will function.

  THE PROBLEM
  When I try to run SDDM I get an error (Which I will try to copy down to add to this bug when I am on a different computer than the one I am reporting the bug about.).

  Installing lightDM does not work... it installs but is either will not
  run or will not actually start a x session.

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