/usr/include/KF5/ is in libkf5activities-dev 5.18.0-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/KF5/KActivities/
/usr/include/KF5/KActivities/KActivities/
/usr/include/KF5/KActivities/KActivities/Consumer
/usr/include/KF5/KActivities/KActivities/Controller
/usr/include/KF5/KActivities/KActivities/Info
/usr/include/KF5/KActivities/KActivities/ResourceInstance
/usr/include/KF5/KActivities/KActivities/Version
/usr/include/KF5/KActivities/kactivities/
/usr/include/KF5/KActivities/kactivities/consumer.h
/usr/include/KF5/KActivities/kactivities/controller.h
/usr/include/KF5/KActivities/kactivities/info.h
/usr/include/KF5/KActivities/kactivities/kactivities_export.h
/usr/include/KF5/KActivities/kactivities/resourceinstance.h
/usr/include/KF5/KActivities/kactivities/version.h
/usr/include/KF5/kactivities_version.h