Public bug reported:

When sddm is currently active (no users logged in on the desktop) and a
monitor is disconnected, the screen of the remaining monitors suddenly
go blank and the display manager is unusable until it is restarted.

The only way to rectify this issue is to switch to a text console and
manually restart the service through systemctl.

Note that this appears to only affect sddm when it is started via
systemd.  When sddm is executed manually as root (via the command 'sudo
sddm'), this issue cannot be repeated.

Attached is the sddm logs.

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

** Attachment added: "sddm log of when the issue occurs"
   https://bugs.launchpad.net/bugs/1632940/+attachment/4760140/+files/sddm.log

** Description changed:

  When sddm is currently active (no users logged in on the desktop) and a
  monitor is disconnected, the screen of the remaining monitors suddenly
  go blank and the display manager is unusable until it is restarted.
  
  The only way to rectify this issue is to switch to a text console and
  manually restart the service through systemctl.
  
  Note that this appears to only affect sddm when it is started via
  systemd.  When sddm is executed manually as root (via the command 'sudo
- sddm', this issue cannot be repeated.
+ sddm'), this issue cannot be repeated.
  
  Attached is the sddm logs.

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https://bugs.launchpad.net/bugs/1632940

Title:
  sddm-greeter crashes on monitor disconnect

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