/usr/ is in libmate-panel-applet-dev 1.20.1-3ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/mate-panel-4.0/
/usr/include/mate-panel-4.0/libmate-panel-applet/
/usr/include/mate-panel-4.0/libmate-panel-applet/mate-panel-applet-enums.h
/usr/include/mate-panel-4.0/libmate-panel-applet/mate-panel-applet-gsettings.h
/usr/include/mate-panel-4.0/libmate-panel-applet/mate-panel-applet.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/libmatepanelapplet-4.0.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libmate-panel-applet-dev/
/usr/share/doc/libmate-panel-applet-dev/copyright
/usr/share/gir-1.0/
/usr/share/gir-1.0/MatePanelApplet-4.0.gir
/usr/lib/x86_64-linux-gnu/libmate-panel-applet-4.so
/usr/share/doc/libmate-panel-applet-dev/changelog.Debian.gz