/usr/include/KF5/KService/ is in libkf5service-dev 5.18.0-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/KF5/KService/KAutostart
/usr/include/KF5/KService/KDBusServiceStarter
/usr/include/KF5/KService/KMimeTypeTrader
/usr/include/KF5/KService/KPluginInfo
/usr/include/KF5/KService/KPluginTrader
/usr/include/KF5/KService/KService
/usr/include/KF5/KService/KServiceAction
/usr/include/KF5/KService/KServiceGroup
/usr/include/KF5/KService/KServiceType
/usr/include/KF5/KService/KServiceTypeProfile
/usr/include/KF5/KService/KServiceTypeTrader
/usr/include/KF5/KService/KSycoca
/usr/include/KF5/KService/KSycocaEntry
/usr/include/KF5/KService/KSycocaType
/usr/include/KF5/KService/KToolInvocation
/usr/include/KF5/KService/kautostart.h
/usr/include/KF5/KService/kdbusservicestarter.h
/usr/include/KF5/KService/kmimetypetrader.h
/usr/include/KF5/KService/kplugininfo.h
/usr/include/KF5/KService/kplugintrader.h
/usr/include/KF5/KService/kservice.h
/usr/include/KF5/KService/kservice_export.h
/usr/include/KF5/KService/kserviceaction.h
/usr/include/KF5/KService/kservicegroup.h
/usr/include/KF5/KService/kservicetype.h
/usr/include/KF5/KService/kservicetypeprofile.h
/usr/include/KF5/KService/kservicetypetrader.h
/usr/include/KF5/KService/ksycoca.h
/usr/include/KF5/KService/ksycocaentry.h
/usr/include/KF5/KService/ksycocatype.h
/usr/include/KF5/KService/ktoolinvocation.h