/usr/share/applications/screensavers/deco.desktop is in xscreensaver-data 5.36-1ubuntu1.
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]
Name=Deco
Exec=/usr/lib/xscreensaver/deco -root
TryExec=/usr/lib/xscreensaver/deco
Comment=Subdivides and colors rectangles randomly. It looks kind of like Brady-Bunch-era rec-room wall paneling. http://en.wikipedia.org/wiki/Piet_Mondrian#Paris_1919.E2.80.931938 Written by Jamie Zawinski and Michael Bayne.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=MATE;
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