/usr/include/KF5/KGuiAddons/ is in libkf5guiaddons-dev 5.18.0-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/KF5/KGuiAddons/KColorCollection
/usr/include/KF5/KGuiAddons/KColorMimeData
/usr/include/KF5/KGuiAddons/KColorUtils
/usr/include/KF5/KGuiAddons/KDateValidator
/usr/include/KF5/KGuiAddons/KFontUtils
/usr/include/KF5/KGuiAddons/KIconUtils
/usr/include/KF5/KGuiAddons/KImageCache
/usr/include/KF5/KGuiAddons/KModifierKeyInfo
/usr/include/KF5/KGuiAddons/KWordWrap
/usr/include/KF5/KGuiAddons/kcolorcollection.h
/usr/include/KF5/KGuiAddons/kcolormimedata.h
/usr/include/KF5/KGuiAddons/kcolorutils.h
/usr/include/KF5/KGuiAddons/kdatevalidator.h
/usr/include/KF5/KGuiAddons/kfontutils.h
/usr/include/KF5/KGuiAddons/kguiaddons_export.h
/usr/include/KF5/KGuiAddons/kiconutils.h
/usr/include/KF5/KGuiAddons/kimagecache.h
/usr/include/KF5/KGuiAddons/klocalimagecacheimpl.h
/usr/include/KF5/KGuiAddons/kmodifierkeyinfo.h
/usr/include/KF5/KGuiAddons/kwordwrap.h