/usr/include/KF5/KrossCore/Kross/ is in kross-dev 5.18.0-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/KF5/KrossCore/Kross/Core/
/usr/include/KF5/KrossCore/Kross/Core/Action
/usr/include/KF5/KrossCore/Kross/Core/ActionCollection
/usr/include/KF5/KrossCore/Kross/Core/ChildrenInterface
/usr/include/KF5/KrossCore/Kross/Core/ErrorInterface
/usr/include/KF5/KrossCore/Kross/Core/Interpreter
/usr/include/KF5/KrossCore/Kross/Core/KrossConfig
/usr/include/KF5/KrossCore/Kross/Core/Manager
/usr/include/KF5/KrossCore/Kross/Core/MetaFunction
/usr/include/KF5/KrossCore/Kross/Core/MetaType
/usr/include/KF5/KrossCore/Kross/Core/Object
/usr/include/KF5/KrossCore/Kross/Core/Script
/usr/include/KF5/KrossCore/Kross/Core/WrapperInterface