/usr/ is in lubuntu-default-settings 0.39.
This file is owned by root:root, with mode 0o755.
..
/usr/share/
/usr/share/lubuntu/
/usr/share/lubuntu/qt/
/usr/share/lubuntu/qt/Trolltech.conf
/usr/share/lubuntu/xscreensaver/
/usr/share/lubuntu/xscreensaver/xscreensaver
/usr/share/lubuntu/pcmanfm/
/usr/share/lubuntu/pcmanfm/main.lubuntu
/usr/share/lubuntu/leafpad/
/usr/share/lubuntu/leafpad/leafpadrc
/usr/share/lubuntu/openbox/
/usr/share/lubuntu/openbox/menu.xml
/usr/share/lubuntu/openbox/rc.xml
/usr/share/applications/
/usr/share/applications/lubuntu-screenlock.desktop
/usr/share/applications/lubuntu-logout.desktop
/usr/share/upstart/
/usr/share/upstart/sessions/
/usr/share/upstart/sessions/lxsession.conf
/usr/share/lxpanel/
/usr/share/lxpanel/profile/
/usr/share/lxpanel/profile/Lubuntu/
/usr/share/lxpanel/profile/Lubuntu/config
/usr/share/lxpanel/profile/Lubuntu/panels/
/usr/share/lxpanel/profile/Lubuntu/panels/panel
/usr/share/xsessions/
/usr/share/xsessions/Lubuntu-Netbook.desktop
/usr/share/xsessions/Lubuntu.desktop
/usr/share/doc/
/usr/share/doc/lubuntu-default-settings/
/usr/share/doc/lubuntu-default-settings/copyright
/usr/share/doc/lubuntu-default-settings/changelog.gz
/usr/share/gdm/
/usr/share/gdm/autostart/
/usr/share/gdm/autostart/LoginWindow/
/usr/share/gdm/autostart/LoginWindow/lxsession.desktop
/usr/bin/
/usr/bin/lubuntu-logout
/usr/bin/openbox-lubuntu