/usr/lib/qt4/examples/layouts/ is in qt4-demos 4:4.8.7+dfsg-5ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/qt4/examples/layouts/README
/usr/lib/qt4/examples/layouts/basiclayouts/
/usr/lib/qt4/examples/layouts/basiclayouts/basiclayouts
/usr/lib/qt4/examples/layouts/basiclayouts/basiclayouts.pro
/usr/lib/qt4/examples/layouts/basiclayouts/dialog.cpp
/usr/lib/qt4/examples/layouts/basiclayouts/dialog.h
/usr/lib/qt4/examples/layouts/basiclayouts/main.cpp
/usr/lib/qt4/examples/layouts/borderlayout/
/usr/lib/qt4/examples/layouts/borderlayout/borderlayout
/usr/lib/qt4/examples/layouts/borderlayout/borderlayout.cpp
/usr/lib/qt4/examples/layouts/borderlayout/borderlayout.h
/usr/lib/qt4/examples/layouts/borderlayout/borderlayout.pro
/usr/lib/qt4/examples/layouts/borderlayout/main.cpp
/usr/lib/qt4/examples/layouts/borderlayout/window.cpp
/usr/lib/qt4/examples/layouts/borderlayout/window.h
/usr/lib/qt4/examples/layouts/dynamiclayouts/
/usr/lib/qt4/examples/layouts/dynamiclayouts/dialog.cpp
/usr/lib/qt4/examples/layouts/dynamiclayouts/dialog.h
/usr/lib/qt4/examples/layouts/dynamiclayouts/dynamiclayouts
/usr/lib/qt4/examples/layouts/dynamiclayouts/dynamiclayouts.pro
/usr/lib/qt4/examples/layouts/dynamiclayouts/main.cpp
/usr/lib/qt4/examples/layouts/flowlayout/
/usr/lib/qt4/examples/layouts/flowlayout/flowlayout
/usr/lib/qt4/examples/layouts/flowlayout/flowlayout.cpp
/usr/lib/qt4/examples/layouts/flowlayout/flowlayout.h
/usr/lib/qt4/examples/layouts/flowlayout/flowlayout.pro
/usr/lib/qt4/examples/layouts/flowlayout/main.cpp
/usr/lib/qt4/examples/layouts/flowlayout/window.cpp
/usr/lib/qt4/examples/layouts/flowlayout/window.h
/usr/lib/qt4/examples/layouts/layouts.pro