Public bug reported:

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.

** Affects: apt (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: nvidia-graphics-drivers-390 (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: sddm (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: sddm (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: nvidia-graphics-drivers-390 (Ubuntu)
   Importance: Undecided
       Status: New

** Description changed:

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

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

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