/usr/ is in ruby-acts-as-list 0.7.2-4.
This file is owned by root:root, with mode 0o755.
..
/usr/share/rubygems-integration/all/specifications/
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-acts-as-list/
/usr/share/doc/ruby-acts-as-list/changelog.Debian.gz
/usr/share/doc/ruby-acts-as-list/README.md.gz
/usr/share/doc/ruby-acts-as-list/copyright
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/acts_as_list-0.7.2.gemspec
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/acts_as_list/
/usr/lib/ruby/vendor_ruby/acts_as_list/version.rb
/usr/lib/ruby/vendor_ruby/acts_as_list/active_record/
/usr/lib/ruby/vendor_ruby/acts_as_list/active_record/acts/
/usr/lib/ruby/vendor_ruby/acts_as_list/active_record/acts/list.rb
/usr/lib/ruby/vendor_ruby/acts_as_list.rb