/usr/share/kde4/apps/plasma-widgetstrip/plasma-default-layoutrc is in plasma-active-data 1:0.5-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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ActionPluginsSource=Global
activity=New Activity
activityId=
desktop=-1
formfactor=0
geometry=0,0,1360,768
immutability=1
lastDesktop=-1
lastScreen=0
location=0
plugin=org.kde.appletstrip
screen=0
wallpaperplugin=image
wallpaperpluginmode=SingleImage
zvalue=0
[Containments][1][Applets][2]
geometry=14,14,532,700
immutability=1
plugin=org.kde.news-qml
zvalue=0
[Containments][1][Applets][3]
geometry=0,0,560,700
immutability=1
plugin=weatherstation
zvalue=0
[Containments][1][General]
AppletsOrder=:2:3
[Containments][1][Wallpaper][image]
wallpaper=/usr/share/wallpapers/default_wallpaper.png
wallpapercolor=0,0,0
wallpaperposition=0
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