This bug was fixed in the package gnome-shell - 3.32.1-1ubuntu1

---------------
gnome-shell (3.32.1-1ubuntu1) eoan; urgency=medium

  [ Marco Trevisan (Treviño) ]
  * Merge with debian
    - Update to 3.32.1 upstream version (LP: #1826936)
    - Fixes Icon disappears from favorites (LP: #1822846)
    - Fix applications aren't focused in Wayland session (LP: #1826176)
    remaining changes:
    + Replace gnome-backgrounds dep with ubuntu-wallpapers and Suggests
      gnome-themes-standard-data, gnome-backgrounds
    + Add some Recommends:
      - ubuntu-session (| gnome-session) to have the ubuntu session available
      - xserver-xorg-legacy
      - yaru-theme-gnome-shell for the default ubuntu theming
    + Update debian/gbp.conf with Ubuntu settings
    + gnome-shell-common.install: Install Ubuntu mode
    + gnome-shell-common.prerm: Remove deprecated ubuntu theme alternative
    + ubuntu/desktop_detect.patch:
      - add caching for desktop detection to avoid querying the current
        desktop env variable as iterate through the list each time. For the
        time of the Shell process, we can expect this env variable to stay
        stable.
    + ubuntu/smarter_alt_tab.patch:
      - quick alt-tab (without showing up the switcher) switch only between
        the last window of the last 2 applications to be focused instead of
        raising all windows of those apps.
    + ubuntu/lightdm-user-switching.patch:
      - Allow user switching when using LightDM.
    + ubuntu/lock_on_suspend.patch
      - Respect Ubuntu's lock-on-suspend setting.
    + ubuntu/gdm.patch
      - as gdm is system-wide and not session-wide, ensure gdm has an ubuntu
        styling by default, not impacting the gnome user session though.
    + ubuntu/background_login.patch
      - Change default background color as we modified the default GDM color
        for our ubuntu session. Change it as well here, still applying the
        background noise loading.
    + ubuntu/gdm_alternatives.patch
      - Add support for GDM3 theme alternatives
    + ubuntu/block_mode_extension_update.patch
      - Don't allow ubuntu mode extension to update
    + optional-hot-corner.patch
      - enable patch proposed by upstream developer already in package (but
        not in series) to add a settings for optional hot corner activation.
    + volume-Add-back-sound-feedback-on-scroll.patch
      - Fix regression causing missing feedback on volume slider scroll
    + main-show-an-error-message-on-gnome-shell-crash.patch,
      global-make-possible-to-set-debug-flags-dynamically.patch,
      main-increase-the-granularity-of-backtraces-in-SHELL_DEBU.patch,
      main-add-backtrace-crashes-all-and-backtrace-all.patch,
      sessionMode-add-support-for-debugFlags-parameter.patch:
      - Improve debug JS tracing for crash reports
    + st-scroll-view-Handle-the-case-where-scrollbars-are-NULL.patch,
      st-scroll-view-Remove-scrollbars-references-on-dispose.patch:
      - Fix crash on theme changes
    + ubuntu/search-call-XUbuntuCancel-method-on-providers-when-no-dat.patch:
      - stop searches when requested from UI
    + magnifier-Show-cursor-when-magnifier-is-enabled-and-scale.patch:
      - Show monitor scaled cursor when magnifier is enabled
  * d/p/magnifier-Show-cursor-when-magnifier-is-enabled-and-scale.patch:
    - Handle the no-monitor case (LP: #1826797)

  [ Andrea Azzarone ]
  * d/p/volume-Add-back-sound-feedback-on-scroll.patch: Add missing import

gnome-shell (3.32.1-1) experimental; urgency=medium

  [ Simon McVittie ]
  * d/rules: Create a temporary HOME, XDG_RUNTIME_DIR for the unit tests.
    This goes some way towards fixing test failures and FTBFS on buster's
    sbuild, as deployed on the s390x buildd.
  * d/.gitignore: Add

  [ Laurent Bigonville ]
  * New upstream release

 -- Marco Trevisan (Treviño) <[email protected]>  Wed, 01 May 2019
10:23:16 +0100

** Changed in: gnome-shell (Ubuntu)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1826797

Title:
  [regression] gnome-shell crashes if booted with the monitor off ["JS
  ERROR: TypeError: monitor is null" from
  _updateContentScale@resource:///org/gnome/shell/ui/magnifier.js:174:9]

Status in gnome-shell package in Ubuntu:
  Fix Released
Status in gnome-shell source package in Disco:
  In Progress

Bug description:
  [ Impact ]

  gnome-shell crashes if booted with the monitor off. This leaves me
  with just a black screen and flashing cursor when I turn the monitor
  on.

  [ Test Case ]

  Boot ubuntu with the monitor off, turn on the monitor.
  GNOME-Shell should run properly with no errors

  [ Regression potential ]

  Mouse cursor isn't scaled properly when using the a11y magnifier

  ----

  Apr 29 09:31:02 kab gnome-shell[995]: JS ERROR: TypeError: monitor is null
                                        
_updateContentScale@resource:///org/gnome/shell/ui/magnifier.js:174:9
                                        
Magnifier@resource:///org/gnome/shell/ui/magnifier.js:160:9
                                        
_initializeUI@resource:///org/gnome/shell/ui/main.js:170:17
                                        
start@resource:///org/gnome/shell/ui/main.js:127:5
                                        @<main>:1:31
  Apr 29 09:31:02 kab gnome-shell[995]: Execution of main.js threw exception: 
Script <main> threw an exception
  Apr 29 09:31:02 kab org.gnome.Shell.desktop[995]: (EE) failed to read Wayland 
events: Connection reset by peer
  Apr 29 09:31:03 kab gnome-shell[1076]: JS ERROR: TypeError: monitor is null
                                         
_updateContentScale@resource:///org/gnome/shell/ui/magnifier.js:174:9
                                         
Magnifier@resource:///org/gnome/shell/ui/magnifier.js:160:9
                                         
_initializeUI@resource:///org/gnome/shell/ui/main.js:170:17
                                         
start@resource:///org/gnome/shell/ui/main.js:127:5
                                         @<main>:1:31
  Apr 29 09:31:03 kab gnome-shell[1076]: Execution of main.js threw exception: 
Script <main> threw an exception
  Apr 29 09:31:03 kab gnome-shell[1094]: JS ERROR: TypeError: monitor is null
                                         
_updateContentScale@resource:///org/gnome/shell/ui/magnifier.js:174:9
                                         
Magnifier@resource:///org/gnome/shell/ui/magnifier.js:160:9
                                         
_initializeUI@resource:///org/gnome/shell/ui/main.js:170:17
                                         
start@resource:///org/gnome/shell/ui/main.js:127:5
                                         @<main>:1:31
  Apr 29 09:31:03 kab gnome-shell[1094]: Execution of main.js threw exception: 
Script <main> threw an exception

  ProblemType: BugDistroRelease: Ubuntu 19.04
  Package: gnome-shell 3.32.0+git20190410-1ubuntu1
  ProcVersionSignature: Ubuntu 5.0.0-14.15-generic 5.0.6
  Uname: Linux 5.0.0-14-generic x86_64
  ApportVersion: 2.20.10-0ubuntu27
  Architecture: amd64
  Date: Mon Apr 29 09:33:16 2019
  DisplayManager: gdm3
  InstallationDate: Installed on 2018-12-04 (145 days ago)
  InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Alpha amd64 
(20181203)SourcePackage: gnome-shell
  UpgradeStatus: No upgrade log present (probably fresh install)

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