Tried to launch Libreoffice

[Richard]

dpkg -s libwayland-server0 | egrep ^V
Version: 1.10.0-1~xenial0
dpkg -s gnome-shell | egrep ^V
Version: 3.20.1-0ubuntu1~xenial1
uname -r
4.4.0-21-generic
lsb_release -ds
Ubuntu 16.04 LTS

Apr 22 11:57:19 airfox org.gnome.Shell.desktop[1870]: (EE)
Apr 22 11:57:19 airfox org.gnome.Shell.desktop[1870]: (EE) Backtrace:
Apr 22 11:57:19 airfox org.gnome.Shell.desktop[1870]: (EE) 0: /usr/bin/Xwayland (xorg_backtrace+0x4e) [0x5608f4b9f7de]
Apr 22 11:57:19 airfox org.gnome.Shell.desktop[1870]: (EE) 1: /usr/bin/Xwayland (0x5608f4a02000+0x1a1b69) [0x5608f4ba3b69]
Apr 22 11:57:19 airfox org.gnome.Shell.desktop[1870]: (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7f647d7ac000+0x354a0) [0x7f647d7e14a0]
Apr 22 11:57:19 airfox org.gnome.Shell.desktop[1870]: (EE) 3: /usr/bin/Xwayland (0x5608f4a02000+0x3c603) [0x5608f4a3e603]
Apr 22 11:57:19 airfox org.gnome.Shell.desktop[1870]: (EE) 4: /usr/lib/x86_64-linux-gnu/libffi.so.6 (ffi_call_unix64+0x4c) [0x7f647d125e40]
Apr 22 11:57:19 airfox org.gnome.Shell.desktop[1870]: (EE) 5: /usr/lib/x86_64-linux-gnu/libffi.so.6 (ffi_call+0x2eb) [0x7f647d1258ab]
Apr 22 11:57:19 airfox org.gnome.Shell.desktop[1870]: (EE) 6: /usr/lib/x86_64-linux-gnu/libwayland-client.so.0 (0x7f647f50d000+0x886e) [0x7f647f51586e]
Apr 22 11:57:19 airfox org.gnome.Shell.desktop[1870]: (EE) 7: /usr/lib/x86_64-linux-gnu/libwayland-client.so.0 (0x7f647f50d000+0x5640) [0x7f647f512640]
Apr 22 11:57:19 airfox org.gnome.Shell.desktop[1870]: (EE) 8: /usr/lib/x86_64-linux-gnu/libwayland-client.so.0 (wl_display_dispatch_queue_pending+0x7c) [0x7f647f51382c]
Apr 22 11:57:19 airfox org.gnome.Shell.desktop[1870]: (EE) 9: /usr/bin/Xwayland (0x5608f4a02000+0x39d47) [0x5608f4a3bd47]
Apr 22 11:57:19 airfox org.gnome.Shell.desktop[1870]: (EE) 10: /usr/bin/Xwayland (WakeupHandler+0x6d) [0x5608f4b6e47d]
Apr 22 11:57:19 airfox org.gnome.Shell.desktop[1870]: (EE) 11: /usr/bin/Xwayland (WaitForSomething+0x1ef) [0x5608f4b9c52f]
Apr 22 11:57:19 airfox org.gnome.Shell.desktop[1870]: (EE) 12: /usr/bin/Xwayland (0x5608f4a02000+0x16769e) [0x5608f4b6969e]
Apr 22 11:57:19 airfox org.gnome.Shell.desktop[1870]: (EE) 13: /usr/bin/Xwayland (0x5608f4a02000+0x16b8f3) [0x5608f4b6d8f3]
Apr 22 11:57:19 airfox org.gnome.Shell.desktop[1870]: (EE) 14: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf0) [0x7f647d7cc830]
Apr 22 11:57:19 airfox org.gnome.Shell.desktop[1870]: (EE) 15: /usr/bin/Xwayland (_start+0x29) [0x5608f4a3b3e9]
Apr 22 11:57:19 airfox org.gnome.Shell.desktop[1870]: (EE)
Apr 22 11:57:19 airfox org.gnome.Shell.desktop[1870]: (EE) Segmentation fault at address 0x30
Apr 22 11:57:19 airfox org.gnome.Shell.desktop[1870]: (EE)
Apr 22 11:57:19 airfox org.gnome.Shell.desktop[1870]: Fatal server error:
Apr 22 11:57:19 airfox org.gnome.Shell.desktop[1870]: (EE) Caught signal 11 (Segmentation fault). Server aborting
Apr 22 11:57:19 airfox org.gnome.Shell.desktop[1870]: (EE)

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: gnome-shell 3.20.1-0ubuntu1~xenial1 [origin: LP-PPA-gnome3-team-gnome3-staging]
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CurrentDesktop: GNOME
Date: Fri Apr 22 12:07:59 2016
DisplayManager:

InstallationDate: Installed on 2015-10-28 (176 days ago)
InstallationMedia: Ubuntu-Server 15.10 "Wily Werewolf" - Release amd64 (20151021)
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to xenial on 2016-03-12 (41 days ago)

[Richard (ismail-a)]

GNOME Shell froze. Eventually restarted to gdm login