Update Worksheet.md

Author: rvosa

docs/2015-05-12/Worksheet.md

@@ -20,5 +20,7 @@ Launching a tiny Linux with Vagrant
 - Create a new folder in the terminal and navigate into it. Then run the initialization command.
 - There should now be a file called `Vagrantfile`. Open it in a text editor.
 - Assign more RAM (2048) to the VM by editing the Vagrantfile.
+- Turn on the GUI 
 - This box does not use `bash`, it uses `sh`. Specify this in the Vagrantfile using `config.ssh.shell="sh"`
 - When you're done configuring the Vagrantfile, save it, then launch the VM with `vagrant up`
+- There might be some error messages where it tries to "mount" folders. If you wait long enough it'll give up - it's not a problem.