/usr/share/mate-panel/layouts/ubuntu.layout is in mate-panel 1.20.1-3ubuntu1.
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=top
size=24
[Toplevel bottom]
expand=true
orientation=bottom
size=24
[Object menu-bar]
object-type=menu-bar
toplevel-id=top
position=0
locked=true
[Object firefox]
locked=True
position=10
launcher-location=/usr/share/applications/firefox.desktop
toplevel-id=top
object-type=launcher
menu-path=applications:/
[Object notification-area]
object-type=applet
applet-iid=NotificationAreaAppletFactory::NotificationArea
toplevel-id=top
position=30
panel-right-stick=true
locked=true
[Object clock]
object-type=applet
applet-iid=ClockAppletFactory::ClockApplet
toplevel-id=top
position=20
panel-right-stick=true
locked=true
[Object shutdown]
action-type=shutdown
object-type=action
position=10
panel-right-stick=true
toplevel-id=top
locked=true
[Object show-desktop]
object-type=applet
applet-iid=WnckletFactory::ShowDesktopApplet
toplevel-id=bottom
position=0
locked=true
[Object window-list]
object-type=applet
applet-iid=WnckletFactory::WindowListApplet
toplevel-id=bottom
position=20
locked=true
[Object workspace-switcher]
object-type=applet
applet-iid=WnckletFactory::WorkspaceSwitcherApplet
toplevel-id=bottom
position=10
panel-right-stick=true
locked=true
[Object trashapplet]
locked=True
position=0
toplevel-id=bottom
applet-iid=TrashAppletFactory::TrashApplet
object-type=applet
panel-right-stick=true
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