#0  0x00007fcb01e17369 in g_logv (log_domain=0x7fcb01747f78 "GLib-GIO", log_level=G_LOG_LEVEL_ERROR, format=<optimized out>, args=args@entry=0x7fffb8ebdeb8) at /build/buildd/glib2.0-2.37.6/./glib/gmessages.c:989
  [Error: /build/buildd/glib2.0-2.37.6/./glib/gmessages.c was not found in source tree]
#1  0x00007fcb01e174b2 in g_log (log_domain=log_domain@entry=0x7fcb01747f78 "GLib-GIO", log_level=log_level@entry=G_LOG_LEVEL_ERROR, format=format@entry=0x7fcb01765930 "Settings schema '%s' is not installed\n") at /build/buildd/glib2.0-2.37.6/./glib/gmessages.c:1025
  [Error: /build/buildd/glib2.0-2.37.6/./glib/gmessages.c was not found in source tree]
#2  0x00007fcb0170452f in g_settings_set_property (object=<optimized out>, prop_id=<optimized out>, value=<optimized out>, pspec=<optimized out>) at /build/buildd/glib2.0-2.37.6/./gio/gsettings.c:492
  [Error: /build/buildd/glib2.0-2.37.6/./gio/gsettings.c was not found in source tree]
#3  0x00007fcb020de8a9 in object_set_property (nqueue=0x1cf5070, value=<optimized out>, pspec=0x1d9f140, object=0x1f0ec30) at /build/buildd/glib2.0-2.37.6/./gobject/gobject.c:1366
  [Error: /build/buildd/glib2.0-2.37.6/./gobject/gobject.c was not found in source tree]
#4  g_object_new_internal (class=class@entry=0x1d118c0, params=params@entry=0x7fffb8ebe140, n_params=1) at /build/buildd/glib2.0-2.37.6/./gobject/gobject.c:1779
  [Error: /build/buildd/glib2.0-2.37.6/./gobject/gobject.c was not found in source tree]
#5  0x00007fcb020e0634 in g_object_new_valist (object_type=object_type@entry=32499584, first_property_name=first_property_name@entry=0x7fcb01765453 "schema-id", var_args=var_args@entry=0x7fffb8ebe298) at /build/buildd/glib2.0-2.37.6/./gobject/gobject.c:2002
  [Error: /build/buildd/glib2.0-2.37.6/./gobject/gobject.c was not found in source tree]
#6  0x00007fcb020e0a14 in g_object_new (object_type=32499584, first_property_name=0x7fcb01765453 "schema-id") at /build/buildd/glib2.0-2.37.6/./gobject/gobject.c:1559
  [Error: /build/buildd/glib2.0-2.37.6/./gobject/gobject.c was not found in source tree]
#7  0x00007fcb0144fadc in ffi_call_unix64 () at ../src/x86/unix64.S:76
  [Error: ../src/x86/unix64.S was not found in source tree]
#8  0x00007fcb0144f40c in ffi_call (cif=cif@entry=0x7fffb8ebe570, fn=fn@entry=0x7fcb01704560 <g_settings_new>, rvalue=rvalue@entry=0x7fffb8ebe550, avalue=avalue@entry=0x7fffb8ebe490) at ../src/x86/ffi64.c:522
  [Error: ../src/x86/ffi64.c was not found in source tree]
#9  0x00007fcb02325d19 in g_callable_info_invoke (info=info@entry=0x1ef9770, function=0x7fcb01704560 <g_settings_new>, in_args=in_args@entry=0x1cf5140, n_in_args=n_in_args@entry=1, out_args=out_args@entry=0x0, n_out_args=n_out_args@entry=0, return_value=return_value@entry=0x7fffb8ebe748, is_method=is_method@entry=0, throws=0, error=error@entry=0x7fffb8ebe6f8) at girepository/gicallableinfo.c:680
  [Error: girepository/gicallableinfo.c was not found in source tree]
#10 0x00007fcb02327057 in g_function_info_invoke (info=info@entry=0x1ef9770, in_args=0x1cf5140, n_in_args=1, out_args=0x0, n_out_args=0, return_value=return_value@entry=0x7fffb8ebe748, error=error@entry=0x7fffb8ebe6f8) at girepository/gifunctioninfo.c:274
  [Error: girepository/gifunctioninfo.c was not found in source tree]
#11 0x00007fcb02563027 in _invoke_callable (function_ptr=0x0, callable_info=0x1ef9770, cache=0x1cf3b60, state=0x7fffb8ebe700) at ../../gi/pygi-invoke.c:64
  [Error: ../../gi/pygi-invoke.c was not found in source tree]
#12 pygi_callable_info_invoke (info=<optimized out>, py_args=py_args@entry=0x1ce45a8, kwargs=<optimized out>, cache=<optimized out>, function_ptr=function_ptr@entry=0x0, user_data=user_data@entry=0x0) at ../../gi/pygi-invoke.c:652
  [Error: ../../gi/pygi-invoke.c was not found in source tree]
#13 0x00007fcb025639bd in _wrap_g_callable_info_invoke (self=<optimized out>, py_args=py_args@entry=0x1ce45a8, kwargs=kwargs@entry=0x0) at ../../gi/pygi-invoke.c:675
  [Error: ../../gi/pygi-invoke.c was not found in source tree]
#14 0x00007fcb0255936e in _callable_info_call (self=0x1dbffb8, args=0x7fcb04368750, kwargs=0x0) at ../../gi/pygi-info.c:428
  [Error: ../../gi/pygi-info.c was not found in source tree]
#15 0x00000000004fe720 in PyObject_Call (kw=0x0, arg=0x7fcb04368750, func=0x1dbffb8) at ../Objects/abstract.c:2529
  [Error: ../Objects/abstract.c was not found in source tree]
#16 do_call (nk=<optimized out>, na=<optimized out>, pp_stack=0x7fffb8ebe8f0, func=0x1dbffb8) at ../Python/ceval.c:4239
  [Error: ../Python/ceval.c was not found in source tree]
#17 call_function (oparg=<optimized out>, pp_stack=0x7fffb8ebe8f0) at ../Python/ceval.c:4044
  [Error: ../Python/ceval.c was not found in source tree]
#18 PyEval_EvalFrameEx (f=f@entry=0x1e0f220, throwflag=throwflag@entry=0) at ../Python/ceval.c:2666
  [Error: ../Python/ceval.c was not found in source tree]
#19 0x00000000004fea32 in fast_function (nk=<optimized out>, na=<optimized out>, n=0, pp_stack=0x7fffb8ebea30, func=0x1ecb668) at ../Python/ceval.c:4107
  [Error: ../Python/ceval.c was not found in source tree]
#20 call_function (oparg=<optimized out>, pp_stack=0x7fffb8ebea30) at ../Python/ceval.c:4042
  [Error: ../Python/ceval.c was not found in source tree]
#21 PyEval_EvalFrameEx (f=f@entry=0x1c8f6c0, throwflag=throwflag@entry=0) at ../Python/ceval.c:2666
  [Error: ../Python/ceval.c was not found in source tree]
#22 0x000000000056c414 in PyEval_EvalCodeEx (co=0x7fcb043bae30, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x0, defcount=0, closure=0x0) at ../Python/ceval.c:3253
  [Error: ../Python/ceval.c was not found in source tree]
#23 0x00000000005ba3b2 in PyEval_EvalCode (co=<optimized out>, globals=<optimized out>, locals=<optimized out>) at ../Python/ceval.c:667
  [Error: ../Python/ceval.c was not found in source tree]
#24 0x00000000005abe1b in run_mod.42564 (mod=<optimized out>, filename=<optimized out>, globals=0x1bfe690, locals=0x1bfe690, flags=<optimized out>, arena=<optimized out>) at ../Python/pythonrun.c:1365
  [Error: ../Python/pythonrun.c was not found in source tree]
#25 0x000000000045270b in PyRun_FileExFlags (fp=fp@entry=0x1c8f6a0, filename=filename@entry=0x7fffb8ec0871 "/usr/share/session-migration/scripts/install-default-webapps-in-launcher.py", start=start@entry=257, globals=globals@entry=0x1bfe690, locals=locals@entry=0x1bfe690, closeit=closeit@entry=1, flags=flags@entry=0x7fffb8ebec70) at ../Python/pythonrun.c:1351
  [Error: ../Python/pythonrun.c was not found in source tree]
#26 0x0000000000452f05 in PyRun_SimpleFileExFlags (fp=fp@entry=0x1c8f6a0, filename=<optimized out>, filename@entry=0x7fffb8ec0871 "/usr/share/session-migration/scripts/install-default-webapps-in-launcher.py", closeit=closeit@entry=1, flags=flags@entry=0x7fffb8ebec70) at ../Python/pythonrun.c:943
  [Error: ../Python/pythonrun.c was not found in source tree]
#27 0x0000000000453001 in PyRun_AnyFileExFlags (fp=fp@entry=0x1c8f6a0, filename=filename@entry=0x7fffb8ec0871 "/usr/share/session-migration/scripts/install-default-webapps-in-launcher.py", closeit=closeit@entry=1, flags=flags@entry=0x7fffb8ebec70) at ../Python/pythonrun.c:747
  [Error: ../Python/pythonrun.c was not found in source tree]
#28 0x0000000000453b6a in Py_Main (argc=<optimized out>, argv=0x7fffb8ebee28) at ../Modules/main.c:640
  [Error: ../Modules/main.c was not found in source tree]
#29 0x00007fcb0339bde5 in __libc_start_main (main=0x453c28 <main>, argc=2, ubp_av=0x7fffb8ebee28, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffb8ebee18) at libc-start.c:260
  [Error: libc-start.c was not found in source tree]
#30 0x000000000057a701 in _start ()