/usr/share/proton-0.14.0/examples/c/ is in libqpid-proton8-dev-examples 0.14.0-5.1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/proton-0.14.0/examples/c/CMakeLists.txt
/usr/share/proton-0.14.0/examples/c/include/
/usr/share/proton-0.14.0/examples/c/include/pncompat/
/usr/share/proton-0.14.0/examples/c/include/pncompat/internal/
/usr/share/proton-0.14.0/examples/c/include/pncompat/internal/getopt.c
/usr/share/proton-0.14.0/examples/c/include/pncompat/internal/getopt.h
/usr/share/proton-0.14.0/examples/c/include/pncompat/misc_defs.h
/usr/share/proton-0.14.0/examples/c/include/pncompat/misc_funcs.inc
/usr/share/proton-0.14.0/examples/c/messenger/
/usr/share/proton-0.14.0/examples/c/messenger/CMakeLists.txt
/usr/share/proton-0.14.0/examples/c/messenger/recv-async.c
/usr/share/proton-0.14.0/examples/c/messenger/recv.c
/usr/share/proton-0.14.0/examples/c/messenger/send-async.c
/usr/share/proton-0.14.0/examples/c/messenger/send.c
/usr/share/proton-0.14.0/examples/c/reactor/
/usr/share/proton-0.14.0/examples/c/reactor/CMakeLists.txt
/usr/share/proton-0.14.0/examples/c/reactor/README
/usr/share/proton-0.14.0/examples/c/reactor/receiver.c
/usr/share/proton-0.14.0/examples/c/reactor/sender.c
/usr/share/proton-0.14.0/examples/cpp/CMakeLists.txt
/usr/share/proton-0.14.0/examples/cpp/README.dox
/usr/share/proton-0.14.0/examples/cpp/broker.cpp
/usr/share/proton-0.14.0/examples/cpp/broker.hpp
/usr/share/proton-0.14.0/examples/cpp/client.cpp
/usr/share/proton-0.14.0/examples/cpp/connection_options.cpp
/usr/share/proton-0.14.0/examples/cpp/direct_recv.cpp
/usr/share/proton-0.14.0/examples/cpp/direct_send.cpp
/usr/share/proton-0.14.0/examples/cpp/encode_decode.cpp
/usr/share/proton-0.14.0/examples/cpp/example_test.py
/usr/share/proton-0.14.0/examples/cpp/fake_cpp11.hpp
/usr/share/proton-0.14.0/examples/cpp/flow_control.cpp
/usr/share/proton-0.14.0/examples/cpp/helloworld.cpp
/usr/share/proton-0.14.0/examples/cpp/helloworld_direct.cpp
/usr/share/proton-0.14.0/examples/cpp/mt/
/usr/share/proton-0.14.0/examples/cpp/mt/broker.cpp
/usr/share/proton-0.14.0/examples/cpp/mt/epoll_container.cpp
/usr/share/proton-0.14.0/examples/cpp/mt/mt_container.hpp
/usr/share/proton-0.14.0/examples/cpp/options.hpp
/usr/share/proton-0.14.0/examples/cpp/queue_browser.cpp
/usr/share/proton-0.14.0/examples/cpp/scheduled_send.cpp
/usr/share/proton-0.14.0/examples/cpp/scheduled_send_03.cpp
/usr/share/proton-0.14.0/examples/cpp/selected_recv.cpp
/usr/share/proton-0.14.0/examples/cpp/server.cpp
/usr/share/proton-0.14.0/examples/cpp/server_direct.cpp
/usr/share/proton-0.14.0/examples/cpp/service_bus.cpp
/usr/share/proton-0.14.0/examples/cpp/simple_recv.cpp
/usr/share/proton-0.14.0/examples/cpp/simple_send.cpp
/usr/share/proton-0.14.0/examples/cpp/ssl.cpp
/usr/share/proton-0.14.0/examples/cpp/ssl_certs/
/usr/share/proton-0.14.0/examples/cpp/ssl_certs/README.txt
/usr/share/proton-0.14.0/examples/cpp/ssl_certs/tclient-certificate.p12
/usr/share/proton-0.14.0/examples/cpp/ssl_certs/tclient-certificate.pem
/usr/share/proton-0.14.0/examples/cpp/ssl_certs/tclient-full.p12
/usr/share/proton-0.14.0/examples/cpp/ssl_certs/tclient-private-key.pem
/usr/share/proton-0.14.0/examples/cpp/ssl_certs/tserver-certificate.p12
/usr/share/proton-0.14.0/examples/cpp/ssl_certs/tserver-certificate.pem
/usr/share/proton-0.14.0/examples/cpp/ssl_certs/tserver-full.p12
/usr/share/proton-0.14.0/examples/cpp/ssl_certs/tserver-private-key.pem
/usr/share/proton-0.14.0/examples/cpp/ssl_client_cert.cpp
/usr/share/proton-0.14.0/examples/cpp/tutorial.dox