gnome-shell crashed with signal 5

[Salvatore LaMendola]

Still reports a crash at every boot. Sorry if this is a duplicate of the last one I submitted. Each time it tells me it's new and asks me to login and report...

ProblemType: Crash
DistroRelease: Ubuntu 18.04
Package: gnome-shell 3.28.0-0ubuntu2
ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
Uname: Linux 4.15.0-13-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.9-0ubuntu2
Architecture: amd64
CrashCounter: 1
CurrentDesktop: GNOME-Greeter:GNOME
Date: Thu Apr 5 18:32:42 2018
DisplayManager: gdm3
ExecutablePath: /usr/bin/gnome-shell
GsettingsChanges:

InstallationDate: Installed on 2016-12-21 (470 days ago)
InstallationMedia: Xubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2)
LocalLibraries: /usr/local/lib/libgcrypt.so.20.2.2 /usr/local/lib/libgpg-error.so.0.22.0
ProcCmdline: /usr/bin/gnome-shell
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/false
Signal: 5
SourcePackage: gnome-shell
StacktraceTop:
 () at /usr/lib/x86_64-linux-gnu/libmutter-2.so.0
 _XIOError () at /usr/lib/x86_64-linux-gnu/libX11.so.6
 _XEventsQueued () at /usr/lib/x86_64-linux-gnu/libX11.so.6
 XPending () at /usr/lib/x86_64-linux-gnu/libX11.so.6
 () at /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
Title: gnome-shell crashed with signal 5
UpgradeStatus: Upgraded to bionic on 2018-01-28 (67 days ago)
UserGroups:

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #1748450, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.