/usr/lib/ is in libignition-msgs-dev 1.0.0+dfsg1-5.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/cmake/
/usr/lib/x86_64-linux-gnu/cmake/ignition-msgs1/
/usr/lib/ruby/
/usr/lib/ruby/ignition/
/usr/lib/ruby/ignition/cmdmsgs.rb
/usr/lib/x86_64-linux-gnu/cmake/ignition-msgs1/ignition-msgs1-config-version.cmake
/usr/lib/x86_64-linux-gnu/cmake/ignition-msgs1/ignition-msgs1-config.cmake
/usr/lib/x86_64-linux-gnu/cmake/ignition-msgs1/ignition-msgs1-targets-relwithdebinfo.cmake
/usr/lib/x86_64-linux-gnu/cmake/ignition-msgs1/ignition-msgs1-targets.cmake
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/ignition-msgs1.pc
/usr/lib/x86_64-linux-gnu/libignition-msgs1.so