/usr/share/applications/screensavers/apple2.desktop is in xscreensaver-data-extra 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=Apple2
Exec=/usr/lib/xscreensaver/apple2 -root
TryExec=/usr/lib/xscreensaver/apple2
Comment=Simulates an original Apple ][ Plus computer in all its 1979 glory. It also reproduces the appearance of display on a color television set of the period. In "Basic Programming Mode", a simulated user types in a BASIC program and runs it. In "Text Mode", it displays the output of a program, or the contents of a file or URL. In "Slideshow Mode", it chooses random images and displays them within the limitations of the Apple ][ display hardware. (Six available colors in hi-res mode!) On X11 systems, This program is also a fully-functional VT100 emulator. http://en.wikipedia.org/wiki/Apple_II_series Written by Trevor Blackwell.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=MATE;
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