/usr/share/ is in ubuntu-mate-default-settings 18.04.17.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/
/usr/share/applications/
/usr/share/applications/mate-mimeapps.list
/usr/share/doc/ubuntu-mate-default-settings/
/usr/share/doc/ubuntu-mate-default-settings/changelog.gz
/usr/share/doc/ubuntu-mate-default-settings/copyright
/usr/share/glib-2.0/
/usr/share/glib-2.0/schemas/
/usr/share/glib-2.0/schemas/30_ubuntu-mate.gschema.override
/usr/share/lightdm/
/usr/share/lightdm/lightdm.conf.d/
/usr/share/lightdm/lightdm.conf.d/50-ubuntu-mate.conf
/usr/share/mate/
/usr/share/mate/applications/
/usr/share/mate/applications/compton.desktop
/usr/share/mate/applications/debian-uxterm.desktop
/usr/share/mate/applications/debian-xterm.desktop
/usr/share/mate/applications/defaults.list
/usr/share/mate/applications/display-im6.desktop
/usr/share/mate/applications/display-im6.q16.desktop
/usr/share/mate/applications/gnome-language-selector.desktop
/usr/share/mate/applications/gtkhash.desktop
/usr/share/mate/applications/kde-Kantiword-Installer.desktop
/usr/share/mate/applications/org.mate-desktop.mate-eiciel.desktop
/usr/share/mate/applications/software-properties-gtk.desktop
/usr/share/mate/applications/tilda.desktop
/usr/share/mate/autostart/
/usr/share/mate/autostart/caja-dropbox-autostart.desktop
/usr/share/mate/autostart/indicator-application.desktop
/usr/share/mate/autostart/indicator-messages.desktop
/usr/share/mate/autostart/indicator-power.desktop
/usr/share/mate/autostart/indicator-session.desktop
/usr/share/mate/autostart/indicator-sound.desktop
/usr/share/mate/autostart/ubuntu-mate-settings-overlay.desktop
/usr/share/mate-panel/
/usr/share/mate-panel/layouts/
/usr/share/mate-panel/layouts/contemporary.layout
/usr/share/mate-panel/layouts/eleven.dock
/usr/share/mate-panel/layouts/eleven.layout
/usr/share/mate-panel/layouts/familiar.layout
/usr/share/mate-panel/layouts/mutiny.layout
/usr/share/mate-panel/layouts/mutiny.panel
/usr/share/mate-panel/layouts/netbook.layout
/usr/share/mate-panel/layouts/netbook.panel
/usr/share/mate-panel/layouts/pantheon.dock
/usr/share/mate-panel/layouts/pantheon.layout
/usr/share/mate-panel/layouts/redmond.layout
/usr/share/mate-panel/layouts/ubuntu-mate.layout
/usr/share/plank/
/usr/share/plank/themes/
/usr/share/plank/themes/Ubuntu-MATE/
/usr/share/plank/themes/Ubuntu-MATE/dock.theme
/usr/share/ubuntu-mate/
/usr/share/ubuntu-mate/settings-overlay/
/usr/share/ubuntu-mate/settings-overlay/config/
/usr/share/ubuntu-mate/settings-overlay/config/Trolltech.conf
/usr/share/ubuntu-mate/settings-overlay/config/folder-color/
/usr/share/ubuntu-mate/settings-overlay/config/folder-color/hide_donation
/usr/share/ubuntu-mate/settings-overlay/config/plank/
/usr/share/ubuntu-mate/settings-overlay/config/plank/dock1/
/usr/share/ubuntu-mate/settings-overlay/config/plank/dock1/launchers/
/usr/share/ubuntu-mate/settings-overlay/config/plank/dock1/launchers/caja.dockitem
/usr/share/ubuntu-mate/settings-overlay/config/plank/dock1/launchers/clock.dockitem
/usr/share/ubuntu-mate/settings-overlay/config/plank/dock1/launchers/desktop.dockitem
/usr/share/ubuntu-mate/settings-overlay/config/plank/dock1/launchers/firefox.dockitem
/usr/share/ubuntu-mate/settings-overlay/config/plank/dock1/launchers/matecc.dockitem
/usr/share/ubuntu-mate/settings-overlay/config/smplayer/
/usr/share/ubuntu-mate/settings-overlay/config/smplayer/smplayer.ini
/usr/share/ubuntu-mate/settings-overlay/config/tilda/
/usr/share/ubuntu-mate/settings-overlay/config/tilda/config_0