/usr/lib/Wt/examples/wtwithqt/ is in witty-examples 3.1.10-1ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/Wt/examples/wtwithqt/CMakeLists.txt
/usr/lib/Wt/examples/wtwithqt/HelloApplication.h
/usr/lib/Wt/examples/wtwithqt/QtObject.C
/usr/lib/Wt/examples/wtwithqt/QtObject.h
/usr/lib/Wt/examples/wtwithqt/README.txt
/usr/lib/Wt/examples/wtwithqt/hello.C
/usr/lib/Wt/examples/wtwithqt/lib/
/usr/lib/Wt/examples/wtwithqt/lib/CMakeLists.txt
/usr/lib/Wt/examples/wtwithqt/lib/DispatchThread.C
/usr/lib/Wt/examples/wtwithqt/lib/DispatchThread.h
/usr/lib/Wt/examples/wtwithqt/lib/README.txt
/usr/lib/Wt/examples/wtwithqt/lib/WQApplication
/usr/lib/Wt/examples/wtwithqt/lib/WQApplication.C
/usr/lib/Wt/examples/wtwithqt/resources