/usr/include/KDE/KNetwork/ is in kdelibs5-dev 4:4.8.2-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/KDE/KNetwork/KActiveSocketBase
/usr/include/KDE/KNetwork/KBufferedSocket
/usr/include/KDE/KNetwork/KClientSocketBase
/usr/include/KDE/KNetwork/KDatagramPacket
/usr/include/KDE/KNetwork/KDatagramSocket
/usr/include/KDE/KNetwork/KHttpProxySocketDevice
/usr/include/KDE/KNetwork/KInetSocketAddress
/usr/include/KDE/KNetwork/KIpAddress
/usr/include/KDE/KNetwork/KPassiveSocketBase
/usr/include/KDE/KNetwork/KResolver
/usr/include/KDE/KNetwork/KResolverEntry
/usr/include/KDE/KNetwork/KResolverResults
/usr/include/KDE/KNetwork/KReverseResolver
/usr/include/KDE/KNetwork/KServerSocket
/usr/include/KDE/KNetwork/KSocketAddress
/usr/include/KDE/KNetwork/KSocketBase
/usr/include/KDE/KNetwork/KSocketDevice
/usr/include/KDE/KNetwork/KSocketDeviceFactory
/usr/include/KDE/KNetwork/KSocksSocketDevice
/usr/include/KDE/KNetwork/KStreamSocket
/usr/include/KDE/KNetwork/KUnixSocketAddress