/usr/ is in ruby-rack-pjax 0.7.0-2.
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/rack-pjax.rb
/usr/lib/ruby/vendor_ruby/rack/
/usr/lib/ruby/vendor_ruby/rack/pjax.rb
/usr/lib/ruby/vendor_ruby/rack/pjax/
/usr/lib/ruby/vendor_ruby/rack/pjax/version.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-rack-pjax/
/usr/share/doc/ruby-rack-pjax/copyright
/usr/share/doc/ruby-rack-pjax/README.md
/usr/share/doc/ruby-rack-pjax/changelog.Debian.gz
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/rack-pjax-0.7.0.gemspec
/usr/share/lintian/
/usr/share/lintian/overrides/
/usr/share/lintian/overrides/ruby-rack-pjax