/usr/ is in ruby-forwardable-extended 2.6.0-1.
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/forwardable/
/usr/lib/ruby/vendor_ruby/forwardable/extended/
/usr/lib/ruby/vendor_ruby/forwardable/extended/version.rb
/usr/lib/ruby/vendor_ruby/forwardable/extended.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-forwardable-extended/
/usr/share/doc/ruby-forwardable-extended/changelog.Debian.gz
/usr/share/doc/ruby-forwardable-extended/copyright
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/forwardable-extended-2.6.0.gemspec