Yes. Here is the output when I ran apport-retrace. Sorry that I can't attach the crash file as it includes some user information. I was a bit careful about not to accidentally include any user info. ========================================================================== apport-retrace -s -R _usr_bin_compiz.19532.crash ========================================================================== gpgv: Can't check signature: public key not found dpkg-source: warning: failed to verify signature on ./compiz_1:0.9.11.3+14.04.20141104-0ubuntu1.dsc dpkg-source: info: extracting compiz in compiz-0.9.11.3+14.04.20141104 dpkg-source: info: unpacking compiz_0.9.11.3+14.04.20141104.orig.tar.gz dpkg-source: info: applying compiz_0.9.11.3+14.04.20141104-0ubuntu1.diff.gz --- stack trace --- #0 0x00007ff17ed06608 in ?? () from /usr/lib/x86_64-linux-gnu/gio/modules/libdconfsettings.so No symbol table info available. #1 0x00007ff17ed06cf3 in ?? () from /usr/lib/x86_64-linux-gnu/gio/modules/libdconfsettings.so No symbol table info available. #2 0x00007ff17ed04e2d in ?? () from /usr/lib/x86_64-linux-gnu/gio/modules/libdconfsettings.so No symbol table info available. #3 0x00007ff17f3fdd02 in g_settings_backend_read (backend=, key=key@entry=0xab011c0 "/org/gnome/desktop/lockdown/disable-lock-screen", expected_type=0x7ff1877135a0 , default_value=default_value@entry=0) at /build/buildd/glib2.0-2.40.2/./gio/gsettingsbackend.c:701 value = #4 0x00007ff17f401c7b in g_settings_read_from_backend (settings=settings@entry=0x7ff13800a570, key=key@entry=0x7fffdde9c920, user_value_only=user_value_only@entry=0, default_value=default_value@entry=0) at /build/buildd/glib2.0-2.40.2/./gio/gsettings.c:1052 value = fixup = path = 0xab011c0 "/org/gnome/desktop/lockdown/disable-lock-screen" #5 0x00007ff17f402e7a in g_settings_get_value (settings=0x7ff13800a570, key=0x2087618 "disable-lock-screen") at /build/buildd/glib2.0-2.40.2/./gio/gsettings.c:1092 skey = {schema = 0x7ff13c017a80, name = 0x4b2fa7c "disable-lock-screen", is_flags = 0, is_enum = 0, strinfo = 0x0, strinfo_length = 0, unparsed = 0x0, lc_char = 0 '\000', type = 0x7ff1877135a0 , minimum = 0x0, maximum = 0x0, default_value = 0xb9c5b30, ref_count = 0} value = __FUNCTION__ = "g_settings_get_value" #6 0x00007ff17f403cfb in g_settings_get_boolean (settings=, key=) at /build/buildd/glib2.0-2.40.2/./gio/gsettings.c:1904 value = result = #7 0x00007ff167992ed9 in unity::session::GnomeManager::CanLock() const () from /usr/lib/libunity-core-6.0.so.9 No symbol table info available. #8 0x00007ff16799429d in unity::session::GnomeManager::Impl::LockScreen(bool) () from /usr/lib/libunity-core-6.0.so.9 No symbol table info available. #9 0x00007ff169591fb7 in ?? () from /usr/lib/compiz/libunityshell.so No symbol table info available. #10 0x00007ff16798e14a in unity::glib::Source::SourceCallback(void*) () from /usr/lib/libunity-core-6.0.so.9 No symbol table info available. #11 0x00007ff187677703 in g_timeout_dispatch (source=0xbaac9a0, callback=, user_data=) at /build/buildd/glib2.0-2.40.2/./glib/gmain.c:4472 timeout_source = 0xbaac9a0 again = #12 0x00007ff187676ce5 in g_main_dispatch (context=0x1ac5170) at /build/buildd/glib2.0-2.40.2/./glib/gmain.c:3064 dispatch = 0x7ff1876776f0 prev_source = 0x0 was_in_call = 0 user_data = 0x116d0aa0 callback = 0x7ff16798e130 cb_funcs = 0x7ff187934920 cb_data = 0x116699e0 need_destroy = source = 0xbaac9a0 current = 0x1abb600 i = 0 #13 g_main_context_dispatch (context=context@entry=0x1ac5170) at /build/buildd/glib2.0-2.40.2/./glib/gmain.c:3663 No locals. #14 0x00007ff187677048 in g_main_context_iterate (context=0x1ac5170, block=block@entry=1, dispatch=dispatch@entry=1, self=) at /build/buildd/glib2.0-2.40.2/./glib/gmain.c:3734 max_priority = 2147483647 timeout = 18 some_ready = 1 nfds = allocated_nfds = 7 fds = 0x4b4e5b0 #15 0x00007ff18767730a in g_main_loop_run (loop=0x1ac4d70) at /build/buildd/glib2.0-2.40.2/./glib/gmain.c:3928 __FUNCTION__ = "g_main_loop_run" #16 0x00007ff18965315b in compiz::private_screen::EventManager::startEventLoop(_XDisplay*) () from /usr/lib/libcompiz_core.so.ABI-20140123 No symbol table info available. #17 0x0000000000401981 in main () No symbol table info available. --- source code stack trace --- #0 0x00007ff17ed06608 in ?? () from /usr/lib/x86_64-linux-gnu/gio/modules/libdconfsettings.so #1 0x00007ff17ed06cf3 in ?? () from /usr/lib/x86_64-linux-gnu/gio/modules/libdconfsettings.so #2 0x00007ff17ed04e2d in ?? () from /usr/lib/x86_64-linux-gnu/gio/modules/libdconfsettings.so #3 0x00007ff17f3fdd02 in g_settings_backend_read (backend=, key=key@entry=0xab011c0 "/org/gnome/desktop/lockdown/disable-lock-screen", expected_type=0x7ff1877135a0 , default_value=default_value@entry=0) at /build/buildd/glib2.0-2.40.2/./gio/gsettingsbackend.c:701 [Error: /build/buildd/glib2.0-2.40.2/./gio/gsettingsbackend.c was not found in source tree] #4 0x00007ff17f401c7b in g_settings_read_from_backend (settings=settings@entry=0x7ff13800a570, key=key@entry=0x7fffdde9c920, user_value_only=user_value_only@entry=0, default_value=default_value@entry=0) at /build/buildd/glib2.0-2.40.2/./gio/gsettings.c:1052 [Error: /build/buildd/glib2.0-2.40.2/./gio/gsettings.c was not found in source tree] #5 0x00007ff17f402e7a in g_settings_get_value (settings=0x7ff13800a570, key=0x2087618 "disable-lock-screen") at /build/buildd/glib2.0-2.40.2/./gio/gsettings.c:1092 [Error: /build/buildd/glib2.0-2.40.2/./gio/gsettings.c was not found in source tree] #6 0x00007ff17f403cfb in g_settings_get_boolean (settings=, key=) at /build/buildd/glib2.0-2.40.2/./gio/gsettings.c:1904 [Error: /build/buildd/glib2.0-2.40.2/./gio/gsettings.c was not found in source tree] #7 0x00007ff167992ed9 in unity::session::GnomeManager::CanLock() const () from /usr/lib/libunity-core-6.0.so.9 #8 0x00007ff16799429d in unity::session::GnomeManager::Impl::LockScreen(bool) () from /usr/lib/libunity-core-6.0.so.9 #9 0x00007ff169591fb7 in ?? () from /usr/lib/compiz/libunityshell.so #10 0x00007ff16798e14a in unity::glib::Source::SourceCallback(void*) () from /usr/lib/libunity-core-6.0.so.9 #11 0x00007ff187677703 in g_timeout_dispatch (source=0xbaac9a0, callback=, user_data=) at /build/buildd/glib2.0-2.40.2/./glib/gmain.c:4472 [Error: /build/buildd/glib2.0-2.40.2/./glib/gmain.c was not found in source tree] #12 0x00007ff187676ce5 in g_main_dispatch (context=0x1ac5170) at /build/buildd/glib2.0-2.40.2/./glib/gmain.c:3064 [Error: /build/buildd/glib2.0-2.40.2/./glib/gmain.c was not found in source tree] #13 g_main_context_dispatch (context=context@entry=0x1ac5170) at /build/buildd/glib2.0-2.40.2/./glib/gmain.c:3663 [Error: /build/buildd/glib2.0-2.40.2/./glib/gmain.c was not found in source tree] #14 0x00007ff187677048 in g_main_context_iterate (context=0x1ac5170, block=block@entry=1, dispatch=dispatch@entry=1, self=) at /build/buildd/glib2.0-2.40.2/./glib/gmain.c:3734 [Error: /build/buildd/glib2.0-2.40.2/./glib/gmain.c was not found in source tree] #15 0x00007ff18767730a in g_main_loop_run (loop=0x1ac4d70) at /build/buildd/glib2.0-2.40.2/./glib/gmain.c:3928 [Error: /build/buildd/glib2.0-2.40.2/./glib/gmain.c was not found in source tree] #16 0x00007ff18965315b in compiz::private_screen::EventManager::startEventLoop(_XDisplay*) () from /usr/lib/libcompiz_core.so.ABI-20140123 #17 0x0000000000401981 in main () =======================================================================================