/usr/share/gnome-panel/panel-default-layout.layout is in gnome-panel-data 1:3.18.2-1ubuntu1.
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 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | [Toplevel top-panel]
expand=true
orientation=top
size=24
[Toplevel bottom-panel]
expand=true
orientation=bottom
size=24
y-bottom=0
[Object menu-bar]
object-iid=PanelInternalFactory::MenuBar
toplevel-id=top-panel
pack-index=0
[Object indicators]
object-iid=IndicatorAppletCompleteFactory::IndicatorAppletComplete
toplevel-id=top-panel
pack-type=end
pack-index=0
[Object show-destkop]
object-iid=WnckletFactory::ShowDesktopApplet
toplevel-id=bottom-panel
pack-index=0
[Object window-list]
object-iid=WnckletFactory::WindowListApplet
toplevel-id=bottom-panel
pack-index=1
[Object workspace-switcher]
object-iid=WnckletFactory::WorkspaceSwitcherApplet
toplevel-id=bottom-panel
pack-type=end
pack-index=0
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