    # File lib/fog/aws/models/compute/spot_request.rb, line 40
            def initialize(attributes={})
              self.groups ||= ["default"]
              self.flavor_id ||= 't1.micro'
              self.image_id   ||= begin
                self.username = 'ubuntu'

                # Old 'connection' is renamed as service and should be used instead
                prepare_service_value(attributes)

                case @service.instance_variable_get(:@region) # Ubuntu 10.04 LTS 64bit (EBS)
                when 'ap-northeast-1'
                  'ami-5e0fa45f'
                when 'ap-southeast-1'
                  'ami-f092eca2'
                when 'eu-west-1'
                  'ami-3d1f2b49'
                when 'us-east-1'
                  'ami-3202f25b'
                when 'us-west-1'
                  'ami-f5bfefb0'
                end
              end
              super
            end