Also tracking in:
https://errors.ubuntu.com/problem/dd87180eee24f496777a479c52715703596eb268


** Information type changed from Private to Public

** Description changed:

+ https://errors.ubuntu.com/problem/dd87180eee24f496777a479c52715703596eb268
+ 
+ ---
+ 
  happened on screensaver activation
  
  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: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu2
  Architecture: amd64
  CrashCounter: 1
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Apr  4 11:13:09 2018
  DisplayManager: gdm3
  ExecutablePath: /usr/bin/gnome-shell
  GsettingsChanges:
-  b'org.gnome.shell' b'enabled-extensions' b"['keepaw...@jepfa.de']"
-  b'org.gnome.shell' b'app-picker-view' b'uint32 1'
-  b'org.gnome.shell' b'favorite-apps' b"['org.gnome.Software.desktop', 
'org.gnome.Nautilus.desktop', 'google-chrome.desktop', 'firefox.desktop', 
'org.gnome.Terminal.desktop', 'jetbrains-phpstorm.desktop', 
'skypeforlinux.desktop', 'gnome-control-center.desktop', 
'org.gnome.gedit.desktop', 'dbeaver.desktop']"
-  b'org.gnome.desktop.interface' b'gtk-im-module' b"'gtk-im-context-simple'"
+  b'org.gnome.shell' b'enabled-extensions' b"['keepaw...@jepfa.de']"
+  b'org.gnome.shell' b'app-picker-view' b'uint32 1'
+  b'org.gnome.shell' b'favorite-apps' b"['org.gnome.Software.desktop', 
'org.gnome.Nautilus.desktop', 'google-chrome.desktop', 'firefox.desktop', 
'org.gnome.Terminal.desktop', 'jetbrains-phpstorm.desktop', 
'skypeforlinux.desktop', 'gnome-control-center.desktop', 
'org.gnome.gedit.desktop', 'dbeaver.desktop']"
+  b'org.gnome.desktop.interface' b'gtk-im-module' b"'gtk-im-context-simple'"
  InstallationDate: Installed on 2018-03-13 (21 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180311)
  ProcCmdline: /usr/bin/gnome-shell
  ProcEnviron:
-  LANGUAGE=en_GB:en
-  PATH=(custom, user)
-  XDG_RUNTIME_DIR=<set>
-  LANG=en_GB.UTF-8
-  SHELL=/bin/bash
+  LANGUAGE=en_GB:en
+  PATH=(custom, user)
+  XDG_RUNTIME_DIR=<set>
+  LANG=en_GB.UTF-8
+  SHELL=/bin/bash
  SegvAnalysis:
-  Segfault happened at: 0x7fecaee5fe53 <meta_monitor_get_main_output+3>:       
jmpq   *0x88(%rax)
-  PC (0x7fecaee5fe53) ok
-  source "*0x88(%rax)" ok
-  SP (0x7ffd4e598cd8) ok
-  Reason could not be automatically determined.
+  Segfault happened at: 0x7fecaee5fe53 <meta_monitor_get_main_output+3>:       
jmpq   *0x88(%rax)
+  PC (0x7fecaee5fe53) ok
+  source "*0x88(%rax)" ok
+  SP (0x7ffd4e598cd8) ok
+  Reason could not be automatically determined.
  Signal: 11
  SourcePackage: gnome-shell
  StacktraceTop:
-  meta_monitor_get_main_output () from 
/usr/lib/x86_64-linux-gnu/libmutter-2.so.0
-  meta_monitor_get_vendor () from /usr/lib/x86_64-linux-gnu/libmutter-2.so.0
-  ?? () from /usr/lib/x86_64-linux-gnu/libmutter-2.so.0
-  ?? () from /usr/lib/x86_64-linux-gnu/libmutter-2.so.0
-  ?? () from /usr/lib/x86_64-linux-gnu/libmutter-2.so.0
+  meta_monitor_get_main_output () from 
/usr/lib/x86_64-linux-gnu/libmutter-2.so.0
+  meta_monitor_get_vendor () from /usr/lib/x86_64-linux-gnu/libmutter-2.so.0
+  ?? () from /usr/lib/x86_64-linux-gnu/libmutter-2.so.0
+  ?? () from /usr/lib/x86_64-linux-gnu/libmutter-2.so.0
+  ?? () from /usr/lib/x86_64-linux-gnu/libmutter-2.so.0
  Title: gnome-shell crashed with SIGSEGV in meta_monitor_get_main_output()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

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https://bugs.launchpad.net/bugs/1761131

Title:
  gnome-shell crashed with SIGSEGV in meta_monitor_get_main_output()
  from meta_monitor_get_vendor() from logical_monitor_find_monitor()
  from meta_input_settings_find_monitor() from update_device_display()

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