/usr/share/plasma/plasmoids/org.kde.plasma.bluetooth/ is in bluedevil 4:5.12.4-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/plasma/plasmoids/org.kde.plasma.bluetooth/contents/
/usr/share/plasma/plasmoids/org.kde.plasma.bluetooth/contents/code/
/usr/share/plasma/plasmoids/org.kde.plasma.bluetooth/contents/code/logic.js
/usr/share/plasma/plasmoids/org.kde.plasma.bluetooth/contents/ui/
/usr/share/plasma/plasmoids/org.kde.plasma.bluetooth/contents/ui/BluetoothApplet.qml
/usr/share/plasma/plasmoids/org.kde.plasma.bluetooth/contents/ui/CompactRepresentation.qml
/usr/share/plasma/plasmoids/org.kde.plasma.bluetooth/contents/ui/DeviceItem.qml
/usr/share/plasma/plasmoids/org.kde.plasma.bluetooth/contents/ui/FullRepresentation.qml
/usr/share/plasma/plasmoids/org.kde.plasma.bluetooth/contents/ui/Header.qml
/usr/share/plasma/plasmoids/org.kde.plasma.bluetooth/contents/ui/MediaPlayerItem.qml
/usr/share/plasma/plasmoids/org.kde.plasma.bluetooth/contents/ui/SwitchButton.qml
/usr/share/plasma/plasmoids/org.kde.plasma.bluetooth/contents/ui/Toolbar.qml
/usr/share/plasma/plasmoids/org.kde.plasma.bluetooth/metadata.desktop
/usr/share/plasma/plasmoids/org.kde.plasma.bluetooth/metadata.json