/usr/lib/ is in libkf5webengineviewer-dev 4:17.12.3-0ubuntu3.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/cmake/
/usr/lib/x86_64-linux-gnu/cmake/KF5WebEngineViewer/
/usr/lib/x86_64-linux-gnu/cmake/KF5WebEngineViewer/KF5WebEngineViewerConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/KF5WebEngineViewer/KF5WebEngineViewerConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/KF5WebEngineViewer/KF5WebEngineViewerTargets-debian.cmake
/usr/lib/x86_64-linux-gnu/cmake/KF5WebEngineViewer/KF5WebEngineViewerTargets.cmake
/usr/lib/x86_64-linux-gnu/qt5/
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/modules/
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/modules/qt_WebEngineViewer.pri
/usr/lib/x86_64-linux-gnu/libKF5WebEngineViewer.so