/usr/share/applications/screensavers/pacman.desktop is in xscreensaver-data-extra 5.15-2ubuntu1.
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=Pacman
Exec=/usr/lib/xscreensaver/pacman -root
TryExec=/usr/lib/xscreensaver/pacman
Comment=Simulates a game of Pac-Man on a randomly-created level. http://en.wikipedia.org/wiki/Pac-Man Written by Edwin de Jong.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;
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