/usr/share/lubuntu/pcmanfm/main.lubuntu is in lubuntu-default-settings 0.46.
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 | [General]
terminal=lxsession-default terminal
[Desktop]
show_wallpaper=1
wallpaper=/usr/share/lubuntu/wallpapers/lubuntu-default-wallpaper.png
show_wm_menu=1
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