/usr/share/ubuntu/settings/system/qml-plugins/wifi/ is in ubuntu-system-settings 0.3+16.04.20160330-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/ubuntu/settings/system/qml-plugins/wifi/AccessPoint.qml
/usr/share/ubuntu/settings/system/qml-plugins/wifi/BaseMenuItem.qml
/usr/share/ubuntu/settings/system/qml-plugins/wifi/CertDialog.qml
/usr/share/ubuntu/settings/system/qml-plugins/wifi/CertPicker.qml
/usr/share/ubuntu/settings/system/qml-plugins/wifi/Common.qml
/usr/share/ubuntu/settings/system/qml-plugins/wifi/DivMenuItem.qml
/usr/share/ubuntu/settings/system/qml-plugins/wifi/FramedMenuItem.qml
/usr/share/ubuntu/settings/system/qml-plugins/wifi/HLine.qml
/usr/share/ubuntu/settings/system/qml-plugins/wifi/IndicatorBase.qml
/usr/share/ubuntu/settings/system/qml-plugins/wifi/MenuItemFactory.qml
/usr/share/ubuntu/settings/system/qml-plugins/wifi/NetworkDetails.qml
/usr/share/ubuntu/settings/system/qml-plugins/wifi/NetworkDetailsBrief.qml
/usr/share/ubuntu/settings/system/qml-plugins/wifi/OtherNetwork.qml
/usr/share/ubuntu/settings/system/qml-plugins/wifi/PageComponent.qml
/usr/share/ubuntu/settings/system/qml-plugins/wifi/PreviousNetworks.qml
/usr/share/ubuntu/settings/system/qml-plugins/wifi/RemoveBackground.qml
/usr/share/ubuntu/settings/system/qml-plugins/wifi/SectionMenuItem.qml
/usr/share/ubuntu/settings/system/qml-plugins/wifi/StandardMenuItem.qml
/usr/share/ubuntu/settings/system/qml-plugins/wifi/SwitchMenuItem.qml