Child environment UIs match the parent

lib/vagrant/environment.rb

@@ -138,6 +138,7 @@ module Vagrant
     # Returns the {UI} for the environment, which is responsible
     # for talking with the outside world.
     def ui
+      return parent.ui if parent
       @ui ||= UI.new(self)
     end
 

lib/vagrant/ui.rb

@@ -35,7 +35,7 @@ module Vagrant
       def report_progress(progress, total, show_parts=true)
         percent = (progress.to_f / total.to_f) * 100
         line = "Progress: #{percent.to_i}%"
-        line << " (#{data[:progress]} / #{data[:total]})" if data[:show_parts]
+        line << " (#{progress} / #{total})" if show_parts
         line = "#{line_reset}#{line}"
 
         @shell.say(line, nil, false)