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

[Thomas Friedrichsmeier]

Same symptoms(*) here after a fresh upgrade to 18.04.

Tried installing gdm, as suggested above, and also adding "xrandr" as
suggested, here: https://forums.fedoraforum.org/showthread.php?316354
-SDDM-shows-black-screen-with-Nvidia . Neither made a difference for me.

However, the problem finally went away after switching to the nouveau
driver. (And I have no recollection of ever asking for the proprietary
nvidia driver, specifically, but I may be wrong about that.)

(*) Symptoms: sddm, but also lightdm and gdm3 showing only black. startx
brings up an xfce session without problems.

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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:
  Confirmed
Status in nvidia-graphics-drivers-390 package in Ubuntu:
  Confirmed
Status in sddm package in Ubuntu:
  Confirmed

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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