/usr/ is in kscreenlocker-dev 5.5.5-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/cmake/
/usr/lib/x86_64-linux-gnu/cmake/ScreenSaverDBusInterface/
/usr/lib/x86_64-linux-gnu/cmake/ScreenSaverDBusInterface/ScreenSaverDBusInterfaceConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/KScreenLocker/
/usr/lib/x86_64-linux-gnu/cmake/KScreenLocker/KScreenLockerConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/KScreenLocker/KScreenLockerTargets-debian.cmake
/usr/lib/x86_64-linux-gnu/cmake/KScreenLocker/KScreenLockerConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/KScreenLocker/KScreenLockerTargets.cmake
/usr/include/
/usr/include/KScreenLocker/
/usr/include/KScreenLocker/KScreenLocker/
/usr/include/KScreenLocker/KScreenLocker/KsldApp
/usr/include/KScreenLocker/KScreenLocker/ksldapp.h
/usr/include/KScreenLocker/KScreenLocker/kscreenlocker_export.h
/usr/share/
/usr/share/dbus-1/
/usr/share/dbus-1/interfaces/
/usr/share/dbus-1/interfaces/kf5_org.freedesktop.ScreenSaver.xml
/usr/share/doc/
/usr/share/doc/kscreenlocker-dev/
/usr/share/doc/kscreenlocker-dev/copyright
/usr/lib/x86_64-linux-gnu/libKScreenLocker.so
/usr/share/doc/kscreenlocker-dev/changelog.Debian.gz