/usr/share/plasma/plasmoids/ is in plasma-nm 4:5.5.5-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/
/usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/
/usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/
/usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/CompactRepresentation.qml
/usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/ConnectionItem.qml
/usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/Header.qml
/usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/PopupDialog.qml
/usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/SwitchButton.qml
/usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/Toolbar.qml
/usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/main.qml
/usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/metadata.desktop