/usr/lib/ruby/1.9.1/gettext/ is in libgettext-ruby1.9.1 2.1.0-2.1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/1.9.1/gettext/cgi.rb
/usr/lib/ruby/1.9.1/gettext/core_ext/
/usr/lib/ruby/1.9.1/gettext/core_ext/iconv.rb
/usr/lib/ruby/1.9.1/gettext/core_ext/string.rb
/usr/lib/ruby/1.9.1/gettext/parser/
/usr/lib/ruby/1.9.1/gettext/parser/erb.rb
/usr/lib/ruby/1.9.1/gettext/parser/glade.rb
/usr/lib/ruby/1.9.1/gettext/parser/ruby.rb
/usr/lib/ruby/1.9.1/gettext/runtime/
/usr/lib/ruby/1.9.1/gettext/runtime/class_info.rb
/usr/lib/ruby/1.9.1/gettext/runtime/locale_path.rb
/usr/lib/ruby/1.9.1/gettext/runtime/mofile.rb
/usr/lib/ruby/1.9.1/gettext/runtime/textdomain.rb
/usr/lib/ruby/1.9.1/gettext/runtime/textdomain_group.rb
/usr/lib/ruby/1.9.1/gettext/runtime/textdomain_manager.rb
/usr/lib/ruby/1.9.1/gettext/tools/
/usr/lib/ruby/1.9.1/gettext/tools.rb
/usr/lib/ruby/1.9.1/gettext/tools/parser/
/usr/lib/ruby/1.9.1/gettext/tools/parser/erb.rb
/usr/lib/ruby/1.9.1/gettext/tools/parser/glade.rb
/usr/lib/ruby/1.9.1/gettext/tools/parser/ruby.rb
/usr/lib/ruby/1.9.1/gettext/tools/pomessage.rb
/usr/lib/ruby/1.9.1/gettext/tools/poparser.rb
/usr/lib/ruby/1.9.1/gettext/tools/rgettext.rb
/usr/lib/ruby/1.9.1/gettext/tools/rmsgfmt.rb
/usr/lib/ruby/1.9.1/gettext/tools/rmsgmerge.rb
/usr/lib/ruby/1.9.1/gettext/utils.rb
/usr/lib/ruby/1.9.1/gettext/version.rb