/usr/lib/x86_64-linux-gnu/ is in libkf5screen-dev 4:5.5.5-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/kscreen2.pc
/usr/lib/x86_64-linux-gnu/cmake/
/usr/lib/x86_64-linux-gnu/cmake/KF5Screen/
/usr/lib/x86_64-linux-gnu/cmake/KF5Screen/KF5ScreenTargets.cmake
/usr/lib/x86_64-linux-gnu/cmake/KF5Screen/KF5ScreenTargets-debian.cmake
/usr/lib/x86_64-linux-gnu/cmake/KF5Screen/KF5ScreenConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/KF5Screen/KF5ScreenConfigVersion.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_KScreen.pri
/usr/lib/x86_64-linux-gnu/libKF5Screen.so