/usr/share/applications/lubuntu-screenlock.desktop is in lubuntu-default-settings 0.39.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | [Desktop Entry]
Name=ScreenLock
Name[zh_TW]=鎖住螢幕
Comment=Lock your screen
Icon=system-lock-screen
Exec=lxlock
NoDisplay=true
|