/etc/xdg/vala-panel/two_panels is in vala-panel-common 0.3.65-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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units = ['toplevel1','toplevel2','wcm','sep1','tlist','pgr','sep2','menubar','launch','sep3','xembed','clock']
[global]
is-custom=false
logout-command='lxsession-logout'
shutdown-command='lxsession-logout'
[toplevel2]
object-type='toplevel'
panel-gravity='south-left'
monitor=-1
height=26
auto-hide=false
[wcm]
toplevel-id='toplevel2'
plugin-type='wincmd'
position=0
left-button-command='iconify'
middle-button-command='shade'
image='gnome-window-manager'
toggle-iconify-and-shade=true
[sep1]
toplevel-id='toplevel2'
plugin-type='separator'
position=1
show-separator=false
size=4
[tlist]
toplevel-id='toplevel2'
plugin-type='tasklist'
position=2
is-expanded=true
[pgr]
toplevel-id='toplevel2'
plugin-type='pager'
position=3
[toplevel1]
object-type='toplevel'
monitor=-1
panel-gravity='north-left'
height=26
auto-hide=false
alignment='center'
[sep2]
toplevel-id='toplevel1'
plugin-type='separator'
position=0
show-separator=false
size=2
[menubar]
toplevel-id='toplevel1'
plugin-type='menumodel'
position=1
icon-name='start-here-symbolic'
is-internal-menu=true
is-system-menu=true
is-menu-bar=true
[launch]
toplevel-id='toplevel1'
plugin-type='launchbar'
launch-buttons=['pcmanfm.desktop', 'gnome-terminal.desktop', 'firefox.desktop']
position=2
[sep3]
toplevel-id='toplevel1'
plugin-type='separator'
is-expanded=true
show-separator=false
size=2
position=3
[xembed]
toplevel-id='toplevel1'
plugin-type='xembed'
position=4
[clock]
toplevel-id='toplevel1'
plugin-type='clock'
clock-format='%R'
tooltip-format='%A %x'
bold-font=false
icon-only=false
center-text=true
position=5
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