Hey I guess there is a way to convert your linux install to efi mode. This is from srs5694:
"If you've installed Linux in BIOS mode, the trick will be to get it booting in EFI mode, since switching between BIOS-mode and EFI-mode boots is awkward on most computers. There are a number of ways to do this. The easiest are to use Ubuntu's "Boot Repair" tool or to install rEFInd from Mint. In either case, you may need to fiddle with your firmware settings to get the computer to boot in EFI mode rather than in BIOS mode."
I guess you could try the ubuntu boot repair utility. Good luck! maybe someone who has done this will post.