/usr/share/applications/screensavers/plasma.desktop is in rss-glx 0.9.1-6ubuntu4.
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 8 9 10 | [Desktop Entry]
Encoding=UTF-8
Name=Plasma
Comment=Another one of the nice GL screensavers from the ReallySlick ScreenSavers package written by Terry Walsh
TryExec=plasma
Exec=plasma -r
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver
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