This bug was fixed in the package mutter - 3.28.4-0ubuntu18.04.2

---------------
mutter (3.28.4-0ubuntu18.04.2) bionic; urgency=medium

  [ Marco Trevisan (Treviño) ]
  * d/p/screen-Destroy-window-actors-after-windows-while-unmanagi.patch,
    d/p/screen-Unset-the-active-workspace-and-remove-workspaces-o.patch:
    - Destroy window actors after windows while unmanaging compositor
      (LP: #1832869)
  * d/p/window-Emit-an-error-and-return-when-trying-to-activate-a.patch:
    - window: Emit an error and return when trying to activate an unmanaged
      (LP: #1827401)
  * d/p/stack-Add-a-function-to-get-a-sorted-list-of-focus-candid.patch,
    d/p/test-runner-Add-assert_focused-command.patch,
    d/p/test-runner-Add-dispatch-command.patch,
    d/p/test-runner-Add-sleep-command.patch,
    d/p/tests-Add-accept_focus-command-to-runner-and-client.patch,
    d/p/tests-Add-can_take_focus-command-to-runner-and-client.patch,
    d/p/tests-Verify-focused-window-in-closed-transient-tests.patch,
    d/p/tests-stacking-Add-tests-with-no-input-and-no-take-focus-.patch,
    d/p/window-x11-Accept-any-focusable-window-as-fallback-focus.patch,
    d/p/window-x11-Don-t-double-check-for-unmanaging-windows.patch,
    d/p/window-x11-Focus-the-default-window-with-delay-while-wait.patch,
    d/p/window-x11-Use-any-focusable-window-as-fallback-delayed-f.patch,
    d/p/window-x11-Focus-a-window-in-the-active-workspace-as-take.patch,
    d/p/workspace-Focus-only-ancestors-that-are-focusable.patch:
    - Workspace: Take-Input windows focus fixes (LP: #1791574)
  * debian/libmutter-2-0.symbols: Update with new symbols

  [ Iain Lane ]
  * debian/libmutter-2-0.symbols: Add a tilde. These were added in an Ubuntu
    revision, so they should cause dependencies on the full version - but we
    add a tilde in case of backports.

 -- Iain Lane <[email protected]>  Tue, 09 Jul 2019 17:03:10 +0100

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

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https://bugs.launchpad.net/bugs/1791574

Title:
  gnome-shell crashed with SIGABRT: assertion failed
  "window->display->focus_window != window" in meta_window_unmanage

Status in Mutter:
  Fix Released
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
Status in mutter source package in Disco:
  Fix Released

Bug description:
  [ Description ]

  GNOME Shell crashes when interacting with some "take-input" windows
  such as the jetbrains products (you can snap install the 2008 versions
  which are affected), see
  https://gitlab.gnome.org/GNOME/mutter/issues/308

  [ Test case ]
   Run this script:
   $ wget -O - https://gitlab.gnome.org/3v1n0/mutter/snippets/453/raw | python3

   - The shell should not crash when the windows are closed.

  [ Regression potential ]

  The patch introduces changes to the window focus handling, so a window
  might not be properly focused in some cases.

  [ Notes to the SRU team ]

  This fix is still in process of being released to eoan / disco too.


  ====

  https://errors.ubuntu.com/problem/9b0e145ca11443bc44b35a2050317dd51f5ab5c5
  Upstream issue: https://gitlab.gnome.org/GNOME/mutter/issues/308

  Originally reported as bug 1422253 and fixed in 18.04, but that crash
  (fixed) was due to a different condition.

  Test case: https://gitlab.gnome.org/3v1n0/mutter/snippets/453

  ---

  gnome-shell crashed and restarted while I was using it.

  ProblemType: CrashDistroRelease: Ubuntu 18.10
  Package: gnome-shell 3.30.0-1ubuntu1
  Uname: Linux 4.19.0-041900rc3-generic x86_64
  ApportVersion: 2.20.10-0ubuntu9
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Sep 10 12:39:16 2018
  DisplayManager: gdm3
  EcryptfsInUse: Yes
  ExecutablePath: /usr/bin/gnome-shell
  ExecutableTimestamp: 1536081658
  InstallationDate: Installed on 2017-08-16 (389 days ago)
  InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
  ProcCmdline: /usr/bin/gnome-shell
  ProcCwd: /home/rocko
  ProcEnviron:
   LANGUAGE=en_AU:en
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_AU.UTF-8
   SHELL=/bin/bashSignal: 6SourcePackage: gnome-shell
  StacktraceTop:
   () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
   g_assertion_message_expr () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
   meta_window_unmanage () at /usr/lib/x86_64-linux-gnu/libmutter-3.so.0
   () at /usr/lib/x86_64-linux-gnu/libmutter-3.so.0
   () at /usr/lib/x86_64-linux-gnu/libmutter-3.so.0
  Title: gnome-shell crashed with SIGABRT
  UpgradeStatus: Upgraded to cosmic on 2018-08-15 (25 days ago)
  UserGroups: adm bumblebee cdrom dip kvm lpadmin plugdev sambashare sudo

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