/usr/share/ruby-rails-assets-favico.js/app/assets/javascripts/favico.js/favico.js is in ruby-rails-assets-favico.js 0.3.9~dfsg-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/ruby-rails-assets-favico.js/app/assets/javascripts/favico.js/../../../../../javascript/favico.js/favico.js