/usr/ is in ruby-sinatra-simple-navigation 3.6.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/sinatra/
/usr/lib/ruby/vendor_ruby/sinatra/simple_navigation.rb
/usr/lib/ruby/vendor_ruby/sinatra/simple-navigation.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-sinatra-simple-navigation/
/usr/share/doc/ruby-sinatra-simple-navigation/README.textile
/usr/share/doc/ruby-sinatra-simple-navigation/changelog.Debian.gz
/usr/share/doc/ruby-sinatra-simple-navigation/copyright
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/1.9.1/
/usr/share/rubygems-integration/1.9.1/specifications/
/usr/share/rubygems-integration/1.9.1/specifications/sinatra-simple-navigation-3.6.0.gemspec
/usr/share/rubygems-integration/2.0/
/usr/share/rubygems-integration/2.0/specifications/
/usr/share/rubygems-integration/2.0/specifications/sinatra-simple-navigation-3.6.0.gemspec