/usr/lib/ is in libignition-transport4-dev 4.0.0+dfsg-4.
This file is owned by root:root, with mode 0o755.
..
/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/lib/x86_64-linux-gnu/libignition-transport4.so