/usr/ is in ruby-text-format 1.0.0-4build1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/text-format-1.0.0.gemspec
/usr/share/doc/
/usr/share/doc/ruby-text-format/
/usr/share/doc/ruby-text-format/README
/usr/share/doc/ruby-text-format/copyright
/usr/share/doc/ruby-text-format/ToDo
/usr/share/doc/ruby-text-format/changelog.Debian.gz
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/text/
/usr/lib/ruby/vendor_ruby/text/format/
/usr/lib/ruby/vendor_ruby/text/format/roman.rb
/usr/lib/ruby/vendor_ruby/text/format/alpha.rb
/usr/lib/ruby/vendor_ruby/text/format/number.rb
/usr/lib/ruby/vendor_ruby/text/format.rb