/usr/ is in ruby-merb-assets 1.1.3-2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-merb-assets/
/usr/share/doc/ruby-merb-assets/copyright
/usr/share/doc/ruby-merb-assets/README.gz
/usr/share/doc/ruby-merb-assets/changelog.Debian.gz
/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/merb-assets-1.1.3.gemspec
/usr/share/rubygems-integration/2.0/
/usr/share/rubygems-integration/2.0/specifications/
/usr/share/rubygems-integration/2.0/specifications/merb-assets-1.1.3.gemspec
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/merb-assets.rb
/usr/lib/ruby/vendor_ruby/merb-assets/
/usr/lib/ruby/vendor_ruby/merb-assets/assets_mixin.rb
/usr/lib/ruby/vendor_ruby/merb-assets/assets.rb
/usr/lib/ruby/vendor_ruby/merb-assets/version.rb