/usr/include/Atlas-C++-0.6/Atlas/ is in libatlas-cpp-0.6-dev 0.6.3-4ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/Atlas-C++-0.6/Atlas/Bridge.h
/usr/include/Atlas-C++-0.6/Atlas/Codec.h
/usr/include/Atlas-C++-0.6/Atlas/Codec_impl.h
/usr/include/Atlas-C++-0.6/Atlas/Codecs/
/usr/include/Atlas-C++-0.6/Atlas/Codecs/Bach.h
/usr/include/Atlas-C++-0.6/Atlas/Codecs/Packed.h
/usr/include/Atlas-C++-0.6/Atlas/Codecs/Utility.h
/usr/include/Atlas-C++-0.6/Atlas/Codecs/XML.h
/usr/include/Atlas-C++-0.6/Atlas/Debug.h
/usr/include/Atlas-C++-0.6/Atlas/EncoderBase.h
/usr/include/Atlas-C++-0.6/Atlas/Exception.h
/usr/include/Atlas-C++-0.6/Atlas/Filter.h
/usr/include/Atlas-C++-0.6/Atlas/Formatter.h
/usr/include/Atlas-C++-0.6/Atlas/Funky/
/usr/include/Atlas-C++-0.6/Atlas/Funky/FEncoder.h
/usr/include/Atlas-C++-0.6/Atlas/Message/
/usr/include/Atlas-C++-0.6/Atlas/Message/DecoderBase.h
/usr/include/Atlas-C++-0.6/Atlas/Message/Element.h
/usr/include/Atlas-C++-0.6/Atlas/Message/MEncoder.h
/usr/include/Atlas-C++-0.6/Atlas/Message/QueuedDecoder.h
/usr/include/Atlas-C++-0.6/Atlas/Negotiate.h
/usr/include/Atlas-C++-0.6/Atlas/Net/
/usr/include/Atlas-C++-0.6/Atlas/Net/Loopback.h
/usr/include/Atlas-C++-0.6/Atlas/Net/Stream.h
/usr/include/Atlas-C++-0.6/Atlas/Objects/
/usr/include/Atlas-C++-0.6/Atlas/Objects/Anonymous.h
/usr/include/Atlas-C++-0.6/Atlas/Objects/BaseObject.h
/usr/include/Atlas-C++-0.6/Atlas/Objects/Decoder.h
/usr/include/Atlas-C++-0.6/Atlas/Objects/Dispatcher.h
/usr/include/Atlas-C++-0.6/Atlas/Objects/Encoder.h
/usr/include/Atlas-C++-0.6/Atlas/Objects/Entity.h
/usr/include/Atlas-C++-0.6/Atlas/Objects/Generic.h
/usr/include/Atlas-C++-0.6/Atlas/Objects/ObjectsFwd.h
/usr/include/Atlas-C++-0.6/Atlas/Objects/Operation.h
/usr/include/Atlas-C++-0.6/Atlas/Objects/Root.h
/usr/include/Atlas-C++-0.6/Atlas/Objects/RootEntity.h
/usr/include/Atlas-C++-0.6/Atlas/Objects/RootOperation.h
/usr/include/Atlas-C++-0.6/Atlas/Objects/SmartPtr.h
/usr/include/Atlas-C++-0.6/Atlas/Objects/loadDefaults.h
/usr/include/Atlas-C++-0.6/Atlas/Objects/objectFactory.h
/usr/include/Atlas-C++-0.6/Atlas/Task.h
/usr/include/Atlas-C++-0.6/Atlas/Version.h