This bug was fixed in the package mutter - 3.28.3-2~ubuntu18.04.1

---------------
mutter (3.28.3-2~ubuntu18.04.1) bionic; urgency=medium

  * No-change backport from unstable to bionic

mutter (3.28.3-2) unstable; urgency=medium

  * Team upload

  [ Iain Lane ]
  * debian/gbp.conf: Set the upstream branch to upstream/3.28.x, since we've
    branched for experimental now.

  [ Marco Trevisan (Treviño) ]
  * d/p/native-gpu-Handle-drmModeSetCrtc-failing-gracefully.patch:
    - Avoid crashing when warning about wrongly set crtc mode
      (LP: #1754949)
  * d/p/gpu-kms-Don-t-crash-if-drmModeGetResources-returns-N.patch:
    - Don't crash if drmModeGetResources returns NULL  (LP: #1767956)
  * d/p/window-wayland-Always-update-monitor-for-non-user-ops.patch:
    - Always update monitor in wayland, avoiding crash (LP: #1784398)
  * d/p/monitor-manager-Filter-out-low-screen-resolutions.patch:
    - Don't return screen resolutions that can't be applied (LP: #1772831)
  * d/p/window-Don-t-refuse-to-move-focus-to-the-grab-window.patch,
    d/p/window-Explicitly-exclude-unmanaging-window-from-focus-ag.patch:
    - Don't crash if a modal dialog closes while being dragged
      (LP: #1422253)
  * d/p/monitor-Use-current-monitor-mode-to-check-whether-active.patch:
    - Don't try to use an invalid monitor mode to figure out scaling
      (LP: #1723615)

  [ Simon McVittie ]
  * Sort patch series in upstream order, with patches applied upstream
    first
  * d/copyright: Remove obsolete FSF postal addresses
  * Standards-Version: 4.1.5 (no changes required)
  * Set Rules-Requires-Root to no
  * Update symbols file

mutter (3.28.3-1~ubuntu18.04.1) bionic; urgency=medium

  * No-change backport to bionic (LP: #1783311)

mutter (3.28.3-1) unstable; urgency=medium

  * New upstream release
  * d/p/backends-Add-logical-monitor-monitor-output-crtc-ref-chai.patch,
    d/p/backends-Move-MetaOutput-crtc-field-into-private-struct.patch,
    d/p/clutter-device-evdev-Get-devices-from-main-seat-if-no-rea.patch,
    d/p/clutter-evdev-Don-t-ignore-CAPS-lock-as-modifier.patch,
    d/p/clutter-evdev-ignore-injected-events-from-IM.patch,
    d/p/clutter-seat-evdev-Add-function-to-get-device-by-id.patch,
    d/p/device-manager-evdev-Add-main-seat-to-seats-by-default.patch,
    d/p/device-manager-evdev-Free-the-main-seat-on-finalize.patch,
    d/p/device-manager-evdev-Set-and-unset-the-stage-for-the-main.patch,
    d/p/frames-Allow-for-unknown-mouse-buttons.patch,
    d/p/frames-Handle-touch-events.patch,
    d/p/frames-Make-1st-button-motion-handlers-take-generic-event.patch,
    d/p/renderer-native-Don-t-crash-if-the-FB-surface-can-t-be-lo.patch,
    d/p/wayland-Compare-geometries-after-chaining-up.patch,
    d/p/wayland-Don-t-reset-input-focus-on-text-commit.patch,
    d/p/wayland-Use-cursor-position-in-logical-monitor.patch,
    d/p/wayland-update-enter-leave-output-after-effects.patch,
    d/p/window-actor-add-new-signal-effects-completed.patch:
    Remove patches already applied on 3.28 branch

 -- Marco Trevisan (Treviño) <ma...@ubuntu.com>  Fri, 03 Aug 2018
05:20:10 +0100

** Changed in: mutter (Ubuntu Bionic)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1784398

Title:
  Changing monitor settings crashes on
  meta_window_wayland_move_resize_internal

Status in gnome-shell package in Ubuntu:
  Fix Released
Status in mutter package in Ubuntu:
  Fix Released
Status in mutter source package in Bionic:
  Fix Released

Bug description:
  [ Description ]

  Under wayland adding a monitor in cloned mode might crash g-s

  See upstream bug: https://gitlab.gnome.org/GNOME/mutter/issues/248

  [ Test case ]

  Open an Ubuntu session on Wayland:

  1. Attach another monitor
  2. Mark as cloned display
  3. Gnome-shell should not crash

  
  [ Regression potential ]

  Global scale for attached monitors could not be properly computed, and
  thus if attaching an HiDPI device, the UI could not be scaled properly

To manage notifications about this bug go to:
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