/usr/share/mate-panel/layouts/debian-edu.layout is in debian-edu-artwork 0.902-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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expand=true
orientation=bottom
size=24
[Object menu]
object-type=menu
toplevel-id=bottom
position=0
locked=true
[Object shutdown]
object-type=action
action-type=shutdown
toplevel-id=bottom
position=10
locked=true
[Object logout]
object-type=action
action-type=logout
toplevel-id=bottom
position=20
locked=true
[Object workspace-switcher]
object-type=applet
applet-iid=WnckletFactory::WorkspaceSwitcherApplet
toplevel-id=bottom
position=30
locked=true
[Object show-desktop]
object-type=applet
applet-iid=WnckletFactory::ShowDesktopApplet
toplevel-id=bottom
position=40
locked=true
[Object web-browser]
object-type=launcher
launcher-location=/usr/share/applications/x-www-browser.desktop
toplevel-id=bottom
position=50
locked=true
[Object file-manager]
object-type=launcher
launcher-location=/usr/share/applications/caja.desktop
toplevel-id=bottom
position=60
locked=true
[Object window-list]
object-type=applet
applet-iid=WnckletFactory::WindowListApplet
toplevel-id=bottom
position=70
locked=true
[Object notification-area]
object-type=applet
applet-iid=NotificationAreaAppletFactory::NotificationArea
toplevel-id=bottom
position=10
panel-right-stick=true
locked=true
[Object clock]
object-type=applet
applet-iid=ClockAppletFactory::ClockApplet
toplevel-id=bottom
position=0
panel-right-stick=true
locked=true
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