/usr/ is in ruby-actionpack-action-caching 1.2.0-1.
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/action_controller/
/usr/lib/ruby/vendor_ruby/action_controller/action_caching.rb
/usr/lib/ruby/vendor_ruby/action_controller/caching/
/usr/lib/ruby/vendor_ruby/action_controller/caching/actions.rb
/usr/lib/ruby/vendor_ruby/actionpack/
/usr/lib/ruby/vendor_ruby/actionpack/action_caching/
/usr/lib/ruby/vendor_ruby/actionpack/action_caching/railtie.rb
/usr/lib/ruby/vendor_ruby/actionpack/action_caching.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-actionpack-action-caching/
/usr/share/doc/ruby-actionpack-action-caching/README.md.gz
/usr/share/doc/ruby-actionpack-action-caching/changelog.Debian.gz
/usr/share/doc/ruby-actionpack-action-caching/copyright
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/actionpack-action_caching-1.2.0.gemspec