You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: debian.rb
    path of file: ./repos/foreman/app/models/operatingsystems
    
    the code of the file until where you have to start completion: class Debian < Operatingsystem
  PXEFILES = {:kernel => "linux", :initrd => "initrd.gz"}

  def pxedir(medium_provider = nil)
    if is_subiquity? # support Ubuntu 22.04, whi
    
  def shorten_description(description)
    return "" if description.blank?
    s = description.dup
    s.gsub!('GNU/Linux', '')
    s.gsub!(/\(.+?\)/, '')
    s.squeeze! " "
    s.strip!
    s += '.' + minor unless minor.blank? || s.include?('.')
    s.presence || description
  end