/usr/lib/x86_64-linux-gnu/ is in libkf5activities-dev 5.28.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/cmake/
/usr/lib/x86_64-linux-gnu/cmake/KF5Activities/
/usr/lib/x86_64-linux-gnu/cmake/KF5Activities/KF5ActivitiesConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/KF5Activities/KF5ActivitiesConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/KF5Activities/KF5ActivitiesLibraryTargets-debian.cmake
/usr/lib/x86_64-linux-gnu/cmake/KF5Activities/KF5ActivitiesLibraryTargets.cmake
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/libKActivities.pc
/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_KActivities.pri
/usr/lib/x86_64-linux-gnu/libKF5Activities.so