/usr/lib/ruby/ is in ruby-remotipart 1.2.1-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/generators/
/usr/lib/ruby/vendor_ruby/generators/remotipart/
/usr/lib/ruby/vendor_ruby/generators/remotipart/install/
/usr/lib/ruby/vendor_ruby/generators/remotipart/install/install_generator.rb
/usr/lib/ruby/vendor_ruby/remotipart.rb
/usr/lib/ruby/vendor_ruby/remotipart/
/usr/lib/ruby/vendor_ruby/remotipart/render_overrides.rb
/usr/lib/ruby/vendor_ruby/remotipart/request_helper.rb
/usr/lib/ruby/vendor_ruby/remotipart/rails.rb
/usr/lib/ruby/vendor_ruby/remotipart/view_helper.rb
/usr/lib/ruby/vendor_ruby/remotipart/rails/
/usr/lib/ruby/vendor_ruby/remotipart/rails/version.rb
/usr/lib/ruby/vendor_ruby/remotipart/rails/railtie.rb
/usr/lib/ruby/vendor_ruby/remotipart/rails/engine.rb
/usr/lib/ruby/vendor_ruby/remotipart/middleware.rb