#0  _gtk_settings_get_screen (settings=0x0) at ../../../../gtk/gtksettings.c:3319
  [Error: gtksettings.c was not found in source tree]
#1  0x00007f5325337adc in gtk_css_value_icon_theme_compute (icon_theme=<optimized out>, property_id=<optimized out>, provider=<optimized out>, style=<optimized out>, parent_style=<optimized out>) at ../../../../gtk/gtkcssiconthemevalue.c:84
  [Error: gtkcssiconthemevalue.c was not found in source tree]
#2  0x00007f5325357ea7 in gtk_css_static_style_compute_value (style=0x1e7c320, provider=0x0, parent_style=0x0, id=3, specified=0x7f53258b9b20 <inherit>, section=0x0) at ../../../../gtk/gtkcssstaticstyle.c:237
  [Error: gtkcssstaticstyle.c was not found in source tree]
#3  0x00007f53253430c2 in _gtk_css_lookup_resolve (lookup=lookup@entry=0x1e7e790, provider=provider@entry=0x0, style=style@entry=0x1e7c320, parent_style=parent_style@entry=0x0) at ../../../../gtk/gtkcsslookup.c:122
  [Error: gtkcsslookup.c was not found in source tree]
#4  0x00007f5325357dd2 in gtk_css_static_style_new_compute (provider=provider@entry=0x0, matcher=matcher@entry=0x0, parent=parent@entry=0x0) at ../../../../gtk/gtkcssstaticstyle.c:195
  [Error: gtkcssstaticstyle.c was not found in source tree]
#5  0x00007f5325357e2d in gtk_css_static_style_get_default () at ../../../../gtk/gtkcssstaticstyle.c:164
  [Error: gtkcssstaticstyle.c was not found in source tree]
#6  0x00007f5325343af6 in gtk_css_node_init (cssnode=0x1e73410) at ../../../../gtk/gtkcssnode.c:667
  [Error: gtkcssnode.c was not found in source tree]
#7  0x00007f5326f70071 in g_type_create_instance () from /tmp/apport_sandbox_143bxsyc/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#8  0x00007f5326f5233d in g_object_new_internal () from /tmp/apport_sandbox_143bxsyc/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#9  0x00007f5326f53a15 in g_object_new_with_properties () from /tmp/apport_sandbox_143bxsyc/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#10 0x00007f5326f545c1 in g_object_new () from /tmp/apport_sandbox_143bxsyc/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#11 0x00007f532536076f in gtk_css_widget_node_new (widget=widget@entry=0x1e7c2e0) at ../../../../gtk/gtkcsswidgetnode.c:297
  [Error: gtkcsswidgetnode.c was not found in source tree]
#12 0x00007f532553e17d in gtk_widget_init (instance=0x1e7c2e0, g_class=0x1e798a0) at ../../../../gtk/gtkwidget.c:4465
  [Error: gtkwidget.c was not found in source tree]
#13 0x00007f5326f70071 in g_type_create_instance () from /tmp/apport_sandbox_143bxsyc/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#14 0x00007f5326f5233d in g_object_new_internal () from /tmp/apport_sandbox_143bxsyc/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#15 0x00007f5326f53d85 in g_object_newv () from /tmp/apport_sandbox_143bxsyc/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#16 0x00007f53252e744a in _gtk_builder_construct (builder=0x1afbf10, info=0x1b7faa0, error=0x7ffc75ad91e0) at ../../../../gtk/gtkbuilder.c:718
  [Error: gtkbuilder.c was not found in source tree]
#17 0x00007f53252e8a85 in builder_construct (data=<optimized out>, error=0x7ffc75ad91e0, object_info=0x1b7faa0) at ../../../../gtk/gtkbuilderparser.c:139
  [Error: gtkbuilderparser.c was not found in source tree]
#18 builder_construct (object_info=object_info@entry=0x1b7faa0, error=error@entry=0x7ffc75ad91e0, data=<optimized out>) at ../../../../gtk/gtkbuilderparser.c:124
  [Error: gtkbuilderparser.c was not found in source tree]
#19 0x00007f53252e989b in parse_child (error=0x7ffc75ad91e0, values=0x7ffc75ad9170, names=<optimized out>, element_name=0x1d962a0 "child", data=0x1d98990) at ../../../../gtk/gtkbuilderparser.c:522
  [Error: gtkbuilderparser.c was not found in source tree]
#20 start_element (context=0x1d01b40, element_name=<optimized out>, names=<optimized out>, values=0x7ffc75ad9170, user_data=0x1d98990, error=0x7ffc75ad91e0) at ../../../../gtk/gtkbuilderparser.c:970
  [Error: gtkbuilderparser.c was not found in source tree]
#21 0x00007f5326fed07a in emit_start_element () from /tmp/apport_sandbox_143bxsyc/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#22 0x00007f5326fee3c7 in g_markup_parse_context_parse () from /tmp/apport_sandbox_143bxsyc/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007f53252ea98e in _gtk_builder_parser_parse_buffer (builder=0x1afbf10, filename=0x1b33360 "/usr/share/apport/apport-gtk.ui", buffer=0x1e44100 "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<interface>\n  <!-- interface-requires gtk+ 3.0 -->\n  <object class=\"GtkTreeStore\" id=\"details_treestore\">\n    <columns>\n      <!-- column-name gchararray1 -->\n  "..., length=28353, requested_objs=<optimized out>, error=0x7ffc75ad9310) at ../../../../gtk/gtkbuilderparser.c:1261
  [Error: gtkbuilderparser.c was not found in source tree]
#24 0x00007f53252e4711 in gtk_builder_add_from_file (builder=0x1afbf10, filename=0x1b33360 "/usr/share/apport/apport-gtk.ui", error=0x7ffc75ad9538) at ../../../../gtk/gtkbuilder.c:1038
  [Error: gtkbuilder.c was not found in source tree]
#25 0x00007f532804681e in ffi_call_unix64 () at ../src/x86/unix64.S:76
  [Error: unix64.S was not found in source tree]
#26 0x00007f53280461ef in ffi_call (cif=cif@entry=0x1d1e628, fn=<optimized out>, rvalue=<optimized out>, rvalue@entry=0x7ffc75ad9498, avalue=<optimized out>) at ../src/x86/ffi64.c:525
  [Error: ffi64.c was not found in source tree]
#27 0x00007f53270e907d in pygi_invoke_c_callable (function_cache=0x1d1e580, state=<optimized out>, py_args=<optimized out>, py_kwargs=<optimized out>) at gi/pygi-invoke.c:690
  [Error: pygi-invoke.c was not found in source tree]
#28 0x00007f53270e013c in pygi_function_cache_invoke (function_cache=<optimized out>, py_args=py_args@entry=0x7f5324055410, py_kwargs=py_kwargs@entry=0x0) at gi/pygi-cache.c:863
  [Error: pygi-cache.c was not found in source tree]
#29 0x00007f53270e97b9 in pygi_callable_info_invoke (user_data=0x0, cache=<optimized out>, kwargs=0x0, py_args=0x7f5324055410, info=<optimized out>) at gi/pygi-invoke.c:770
  [Error: pygi-invoke.c was not found in source tree]
#30 _wrap_g_callable_info_invoke (self=<optimized out>, py_args=py_args@entry=0xe6b5e9f377632500, kwargs=kwargs@entry=0x0) at gi/pygi-invoke.c:770
  [Error: pygi-invoke.c was not found in source tree]
#31 0x00007f53270e40fd in _callable_info_call (kwargs=0x0, args=0x7f5324039a50, self=0x7f532602fbf0) at gi/pygi-info.c:556
  [Error: pygi-info.c was not found in source tree]
#32 _callable_info_call (self=0x7f532602fbf0, args=0x7f5324039a50, kwargs=0x0) at gi/pygi-info.c:533
  [Error: pygi-info.c was not found in source tree]
#33 0x00000000005c77a3 in _PyObject_FastCallKeywords (callable=0x7f532602fbf0, stack=<optimized out>, nargs=<optimized out>, kwnames=<optimized out>) at ../Objects/call.c:201
  [Error: call.c was not found in source tree]
#34 0x00000000005360a1 in call_function (pp_stack=0x7ffc75ad96c8, oparg=<optimized out>, kwnames=<optimized out>) at ../Python/ceval.c:4619
  [Error: ceval.c was not found in source tree]
#35 0x000000000053ccfb in _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3093
  [Error: ceval.c was not found in source tree]
#36 0x00000000005c7cba in PyEval_EvalFrameEx (throwflag=0, f=0x1cac020) at ../Python/ceval.c:547
  [Error: ceval.c was not found in source tree]
#37 function_code_fastcall (globals=<optimized out>, nargs=1, args=<optimized out>, co=<optimized out>) at ../Objects/call.c:283
  [Error: call.c was not found in source tree]
#38 _PyFunction_FastCallDict (func=<optimized out>, args=<optimized out>, nargs=1, kwargs=<optimized out>) at ../Objects/call.c:322
  [Error: call.c was not found in source tree]
#39 0x000000000056e686 in _PyObject_FastCallDict (kwargs=0x0, nargs=1, args=0x7ffc75ad9820, callable=0x7f5324075680) at ../Objects/call.c:98
  [Error: call.c was not found in source tree]
#40 _PyObject_Call_Prepend (kwargs=0x0, args=0x7f5327440050, obj=0x7f5327344e10, callable=0x7f5324075680) at ../Objects/call.c:908
  [Error: call.c was not found in source tree]
#41 slot_tp_init (self=0x7f5327344e10, args=0x7f5327440050, kwds=0x0) at ../Objects/typeobject.c:6636
  [Error: typeobject.c was not found in source tree]
#42 0x00000000005c73e6 in type_call (kwds=<optimized out>, args=0x7f5327440050, type=<optimized out>) at ../Objects/typeobject.c:971
  [Error: typeobject.c was not found in source tree]
#43 _PyObject_FastCallKeywords (callable=0x1d017b0, stack=<optimized out>, nargs=<optimized out>, kwnames=<optimized out>) at ../Objects/call.c:199
  [Error: call.c was not found in source tree]
#44 0x00000000005360a1 in call_function (pp_stack=0x7ffc75ad99c0, oparg=<optimized out>, kwnames=<optimized out>) at ../Python/ceval.c:4619
  [Error: ceval.c was not found in source tree]
#45 0x0000000000538cd2 in _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3124
  [Error: ceval.c was not found in source tree]
#46 0x0000000000536c76 in PyEval_EvalFrameEx (throwflag=0, f=0x191a670) at ../Python/ceval.c:547
  [Error: ceval.c was not found in source tree]
#47 _PyEval_EvalCodeWithName (_co=<optimized out>, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kwnames=<optimized out>, kwargs=0x0, kwcount=<optimized out>, kwstep=2, defs=0x0, defcount=0, kwdefs=0x0, closure=0x0, name=0x0, qualname=0x0) at ../Python/ceval.c:3930
  [Error: ceval.c was not found in source tree]
#48 0x000000000064b363 in PyEval_EvalCodeEx (closure=0x0, kwdefs=0x0, defcount=0, defs=0x0, kwcount=0, kws=0x0, argcount=0, args=0x0, locals=<optimized out>, globals=<optimized out>, _co=<optimized out>) at ../Python/ceval.c:3959
  [Error: ceval.c was not found in source tree]
#49 PyEval_EvalCode (co=<optimized out>, globals=<optimized out>, locals=<optimized out>) at ../Python/ceval.c:524
  [Error: ceval.c was not found in source tree]
#50 0x000000000063ea53 in run_mod (mod=<optimized out>, filename=<optimized out>, globals=0x7f53273f6d20, locals=0x7f53273f6d20, flags=<optimized out>, arena=<optimized out>) at ../Python/pythonrun.c:1035
  [Error: pythonrun.c was not found in source tree]
#51 0x000000000063eb07 in PyRun_FileExFlags (fp=0x191aac0, filename_str=<optimized out>, start=<optimized out>, globals=0x7f53273f6d20, locals=0x7f53273f6d20, closeit=1, flags=0x7ffc75ad9c5c) at ../Python/pythonrun.c:988
  [Error: pythonrun.c was not found in source tree]
#52 0x000000000063f8ba in PyRun_SimpleFileExFlags (fp=0x191aac0, filename=<optimized out>, closeit=1, flags=0x7ffc75ad9c5c) at ../Python/pythonrun.c:429
  [Error: pythonrun.c was not found in source tree]
#53 0x000000000067603f in pymain_run_file (p_cf=0x7ffc75ad9c5c, filename=<optimized out>, fp=0x191aac0) at ../Modules/main.c:427
  [Error: main.c was not found in source tree]
#54 pymain_run_filename (cf=0x7ffc75ad9c5c, pymain=0x7ffc75ad9d30) at ../Modules/main.c:1606
  [Error: main.c was not found in source tree]
#55 pymain_run_python (pymain=0x7ffc75ad9d30) at ../Modules/main.c:2867
  [Error: main.c was not found in source tree]
#56 pymain_main (pymain=0x7ffc75ad9d30) at ../Modules/main.c:3028
  [Error: main.c was not found in source tree]
#57 0x000000000067632e in _Py_UnixMain (argc=<optimized out>, argv=<optimized out>) at ../Modules/main.c:3063
  [Error: main.c was not found in source tree]
#58 0x00007f5327e6eea3 in __libc_start_main (main=0x4cf450 <main>, argc=2, argv=0x7ffc75ad9e78, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffc75ad9e68) at ../csu/libc-start.c:308
  [Error: libc-start.c was not found in source tree]
#59 0x00000000005cdcae in _start () at ../Objects/bytesobject.c:3384
  [Error: bytesobject.c was not found in source tree]