You need to reinstall the system and make sure that you boot the Ubuntu install media in EFI mode.  This will prompt it to create the EFI system partition ( if you tell it to use the entire disk ) and install the EFI version of grub.

How to configure GRUB to load Windows 7 Install in UEFI mode
I'm a married man looking for an apartment to live with my wife from February 2014 until April 2014.  How can I find an apartment for this time period?
