Comment 6 for bug 1041631

one of the duplicates has

" g_settings_schema_get_value (schema=schema@entry=0x1e92440, key=key@entry=0x1e98d20 "alt-tab-bias_viewport") at /build/buildd/glib2.0-2.33.10/./gio/gsettingsschema.c:640
 g_settings_schema_key_init (key=key@entry=0x7fff092aeef0, schema=0x1e92440, name=name@entry=0x1e98d20 "alt-tab-bias_viewport") at /build/buildd/glib2.0-2.33.10/./gio/gsettingsschema.c:751
 g_settings_set_value (settings=settings@entry=0x1e845e0, key=key@entry=0x1e98d20 "alt-tab-bias_viewport", value=0x1e998a0) at /build/buildd/glib2.0-2.33.10/./gio/gsettings.c:1350"

not sure if all bugs there have the same issue, for those who reported a duplicate having the output of those command and it they raise an error would be useful;

gsettings-data-convert --file=/usr/lib/compiz/migration/compiz-profile-active-Default.convert
gsettings-data-convert --file=/usr/lib/compiz/migration/compiz-profile-active-unity.convert