This bug was fixed in the package mutter - 3.36.6-1ubuntu0.20.04.2

---------------
mutter (3.36.6-1ubuntu0.20.04.2) focal; urgency=medium

  * xrandr-scaling: Never try to set invalid screen sizes (again!)
    Looks like this change (introduced to fix LP:1889090) got lost while
    rebasing previous fixes, gbp has been a bad guy this time! (LP: #1896818)

mutter (3.36.6-1ubuntu0.20.04.1) focal; urgency=medium

  * Merge with debian, containing new stable release (LP: #1896332)
  * debian/patches:
    - Refresh patches and drop applied ones
    - Don't set the font-dpi on clutter-backend-x11 (LP: #1892440)
    - Cherry-pick upstream night-switch fixes for 3.36 branch
    - Cherry-pick upstream fixes for handling X11 devices removal
      (LP: #1558886)
  * xrandr-scaling: Don't update UI scale factor on xrandr-manager creation
    (LP: #1892440)
  * debian/control: Revert pipewire version bumping
  * Remaining changes with debian:
    - debian/control:
      + Update VCS flags to point to ubuntu salsa branch
    - debian/gbp.conf: update branch to point to ubuntu/master
    - debian/patches/x11-Add-support-for-fractional-scaling-using-Randr.patch:
      + X11: Add support for fractional scaling using Randr

mutter (3.36.6-1) unstable; urgency=medium

  * Team upload
  * New upstream release
  * Update symbols file
  * d/control.in, d/rules: Enable Pipewire on Debian (but not Ubuntu).
    Now that we have Pipewire 0.3, we can enable screencasting and remote
    desktop support again.

mutter (3.36.5-1) unstable; urgency=medium

  * Team upload
  * New upstream release
    - Screencast fixes and improvements
    - Fix glitches when subsurfaces extend outside the toplevel
    - Improve background display in overview workspace switcher
    - Fix wine copy & paste
    - Plug memory leaks
  * Drop patches that were applied upstream

mutter (3.36.4-1) unstable; urgency=medium

  * New upstream stable release (LP: #1887998)
    - Fix crash on area screenshots with fractional scaling
    - Do not paint textures of fully obscured windows
    - Turn off CRTCs as well when enabling DPMS
    - Improve selection support
    - Use a more appropriate combine function on opaque areas
    - Fix remote desktop being broken without screencast session
    - Fix popovers disappearing on wayland and HiDPI
    - Fixed crashes (LP: #1870867, LP: #1857947)
    - Plugged memory leaks
  * d/p/screen-cast-Let-the-reason-for-recording-determine-what-t.patch,
    d/p/screen-cast-src-Add-flag-to-maybe_record.patch,
    d/p/screen-cast-src-Fix-signedness-of-timestamp-field.patch,
    d/p/screen-cast-src-Make-record-functions-return-an-error-whe.patch,
    d/p/screen-cast-src-Make-the-two-record-vfuncs-more-similarly.patch,
    d/p/screen-cast-src-Record-follow-up-frame-after-timeout.patch,
    d/p/screen-cast-src-Remove-follow-up-timeout-source-on-disabl.patch,
    d/p/screen-cast-src-Use-G_USEC_PER_SEC-instead-of-1000000.patch,
    d/p/screen-cast-window-stream-src-Fix-indentation.patch:
    - Import more fixes for screencasting and remote desktop

 -- Marco Trevisan (Treviño) <[email protected]>  Wed, 23 Sep 2020
22:03:53 +0200

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

-- 
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https://bugs.launchpad.net/bugs/1870867

Title:
  gnome-shell crashed with SIGABRT meta_x11_get_stage_window: assertion
  failed: (META_IS_STAGE_X11 (impl))

Status in Mutter:
  Unknown
Status in mutter package in Ubuntu:
  Fix Released
Status in mutter source package in Focal:
  Fix Released

Bug description:
  [ Impact ]

  GNOME Shell crashes in meta_x11_get_stage_window.

  [ Test case ]

  Perform touch events via touchpad or touchscreen, eventually the shell
  will crash.

  Errors can be monitored at:
   https://errors.ubuntu.com/problem/1d4cdd9f2e9cd378a3e0aeed140079f319454bf2

  [ Regression potential ]

  Windows might not be closed correctly when requested via delete-events
  (clicking on clientside decoration close button).

  ---------------

  ProblemType: CrashDistroRelease: Ubuntu 20.04
  Package: gnome-shell 3.36.0-2ubuntu2
  ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
  Uname: Linux 5.4.0-21-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu22
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Apr  4 22:08:06 2020
  DisplayManager: gdm3
  ExecutablePath: /usr/bin/gnome-shell
  ProcCmdline: /usr/bin/gnome-shell
  ProcEnviron:
   LANG=en_US.UTF-8
   PATH=(custom, no user)
   SHELL=/bin/bash
   XDG_RUNTIME_DIR=<set>
  RelatedPackageVersions: mutter-common 3.36.0-2ubuntu1Signal: 6SourcePackage: 
gnome-shell
  StacktraceTop:
   __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
   __GI_abort () at abort.c:79
   ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
   g_assertion_message_expr () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
   ?? () from /lib/x86_64-linux-gnu/libmutter-6.so.0
  Title: gnome-shell crashed with SIGABRT in __GI_raise()
  UpgradeStatus: Upgraded to focal on 2020-04-05 (0 days ago)
  UserGroups: adm cdrom dialout dip docker input libvirt lpadmin plugdev 
sambashare sudo
  separator:

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