/usr/lib/ is in libignition-fuel-tools1-dev 1.0.0+dfsg4-4.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/
/usr/lib/ruby/ignition/
/usr/lib/ruby/ignition/cmdfuel1.rb
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/cmake/
/usr/lib/x86_64-linux-gnu/cmake/ignition-fuel_tools1/
/usr/lib/x86_64-linux-gnu/cmake/ignition-fuel_tools1/ignition-fuel_tools1-config-version.cmake
/usr/lib/x86_64-linux-gnu/cmake/ignition-fuel_tools1/ignition-fuel_tools1-config.cmake
/usr/lib/x86_64-linux-gnu/cmake/ignition-fuel_tools1/ignition-fuel_tools1-targets-relwithdebinfo.cmake
/usr/lib/x86_64-linux-gnu/cmake/ignition-fuel_tools1/ignition-fuel_tools1-targets.cmake
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/ignition-fuel_tools1.pc
/usr/lib/x86_64-linux-gnu/libignition-fuel_tools1.so