Public bug reported:

Ubuntu 16.04 LTS 64 bits : Crash when trying to change theme ("Ambiance"
to "Radiance") in option "Appearance" (system settings).

ProblemType: Crash
DistroRelease: Ubuntu 16.04
Package: unity-control-center 15.04.0+16.04.20160413-0ubuntu1
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
CasperVersion: 1.376
CurrentDesktop: Unity
Date: Sat Apr 23 07:39:51 2016
ExecutablePath: /usr/bin/unity-control-center
ExecutableTimestamp: 1460586476
LiveMediaBuild: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
ProcCmdline: unity-control-center --overview
ProcCwd: /home/ubuntu
ProcEnviron:
 PATH=(custom, no user)
 SHELL=/bin/bash
 LANG=en_US.UTF-8
 XDG_RUNTIME_DIR=<set>
SegvAnalysis:
 Segfault happened at: 0x7f9465f55277 <gtk_widget_get_scale_factor+119>:        
mov    0xc0(%rdx),%rax
 PC (0x7f9465f55277) ok
 source "0xc0(%rdx)" (0x000000c0) not located in a known VMA region (needed 
readable region)!
 destination "%rax" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: unity-control-center
StacktraceTop:
 gtk_widget_get_scale_factor () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
 g_closure_invoke () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
Title: unity-control-center crashed with SIGSEGV in 
gtk_widget_get_scale_factor()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

** Affects: unity-control-center (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-crash need-amd64-retrace xenial

** Information type changed from Private to Public

** Description changed:

- Ubuntu 16.04 LTS 64 bits : Crash when trying to change theme in
- "Appareance" (system settings).
+ Ubuntu 16.04 LTS 64 bits : Crash when trying to change theme ("Ambiance"
+ to "Radiance") in option "Appearance" (system settings).
  
  ProblemType: Crash
  DistroRelease: Ubuntu 16.04
  Package: unity-control-center 15.04.0+16.04.20160413-0ubuntu1
  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
  CasperVersion: 1.376
  CurrentDesktop: Unity
  Date: Sat Apr 23 07:39:51 2016
  ExecutablePath: /usr/bin/unity-control-center
  ExecutableTimestamp: 1460586476
  LiveMediaBuild: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  ProcCmdline: unity-control-center --overview
  ProcCwd: /home/ubuntu
  ProcEnviron:
-  PATH=(custom, no user)
-  SHELL=/bin/bash
-  LANG=en_US.UTF-8
-  XDG_RUNTIME_DIR=<set>
+  PATH=(custom, no user)
+  SHELL=/bin/bash
+  LANG=en_US.UTF-8
+  XDG_RUNTIME_DIR=<set>
  SegvAnalysis:
-  Segfault happened at: 0x7f9465f55277 <gtk_widget_get_scale_factor+119>:      
mov    0xc0(%rdx),%rax
-  PC (0x7f9465f55277) ok
-  source "0xc0(%rdx)" (0x000000c0) not located in a known VMA region (needed 
readable region)!
-  destination "%rax" ok
+  Segfault happened at: 0x7f9465f55277 <gtk_widget_get_scale_factor+119>:      
mov    0xc0(%rdx),%rax
+  PC (0x7f9465f55277) ok
+  source "0xc0(%rdx)" (0x000000c0) not located in a known VMA region (needed 
readable region)!
+  destination "%rax" ok
  SegvReason: reading NULL VMA
  Signal: 11
  SourcePackage: unity-control-center
  StacktraceTop:
-  gtk_widget_get_scale_factor () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
-  ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
-  ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
-  g_closure_invoke () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
-  ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
+  gtk_widget_get_scale_factor () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
+  ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
+  ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
+  g_closure_invoke () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
+  ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
  Title: unity-control-center crashed with SIGSEGV in 
gtk_widget_get_scale_factor()
  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/1573926

Title:
  unity-control-center crashed with SIGSEGV in
  gtk_widget_get_scale_factor()

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