/usr/ is in libignition-transport4-dev 4.0.0+dfsg-4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/ignition/
/usr/include/ignition/transport4/
/usr/include/ignition/transport4/ignition/
/usr/include/ignition/transport4/ignition/transport/
/usr/include/ignition/transport4/ignition/transport/AdvertiseOptions.hh
/usr/include/ignition/transport4/ignition/transport/Discovery.hh
/usr/include/ignition/transport4/ignition/transport/Export.hh
/usr/include/ignition/transport4/ignition/transport/HandlerStorage.hh
/usr/include/ignition/transport4/ignition/transport/Helpers.hh
/usr/include/ignition/transport4/ignition/transport/MessageInfo.hh
/usr/include/ignition/transport4/ignition/transport/NetUtils.hh
/usr/include/ignition/transport4/ignition/transport/Node.hh
/usr/include/ignition/transport4/ignition/transport/NodeOptions.hh
/usr/include/ignition/transport4/ignition/transport/NodeShared.hh
/usr/include/ignition/transport4/ignition/transport/Packet.hh
/usr/include/ignition/transport4/ignition/transport/Publisher.hh
/usr/include/ignition/transport4/ignition/transport/RepHandler.hh
/usr/include/ignition/transport4/ignition/transport/ReqHandler.hh
/usr/include/ignition/transport4/ignition/transport/SubscribeOptions.hh
/usr/include/ignition/transport4/ignition/transport/SubscriptionHandler.hh
/usr/include/ignition/transport4/ignition/transport/TopicStorage.hh
/usr/include/ignition/transport4/ignition/transport/TopicUtils.hh
/usr/include/ignition/transport4/ignition/transport/TransportTypes.hh
/usr/include/ignition/transport4/ignition/transport/Uuid.hh
/usr/include/ignition/transport4/ignition/transport/config.hh
/usr/include/ignition/transport4/ignition/transport/detail/
/usr/include/ignition/transport4/ignition/transport/detail/Export.hh
/usr/include/ignition/transport4/ignition/transport/ign.hh
/usr/include/ignition/transport4/ignition/transport.hh
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/ignition/
/usr/lib/ruby/ignition/cmdtransport4.rb
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/cmake/
/usr/lib/x86_64-linux-gnu/cmake/ignition-transport4/
/usr/lib/x86_64-linux-gnu/cmake/ignition-transport4/ignition-transport4-config-version.cmake
/usr/lib/x86_64-linux-gnu/cmake/ignition-transport4/ignition-transport4-config.cmake
/usr/lib/x86_64-linux-gnu/cmake/ignition-transport4/ignition-transport4-targets-relwithdebinfo.cmake
/usr/lib/x86_64-linux-gnu/cmake/ignition-transport4/ignition-transport4-targets.cmake
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/ignition-transport4.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libignition-transport4-dev/
/usr/share/doc/libignition-transport4-dev/copyright
/usr/share/ignition/
/usr/share/ignition/transport4.yaml
/usr/lib/x86_64-linux-gnu/libignition-transport4.so
/usr/share/doc/libignition-transport4-dev/changelog.Debian.gz