I am running a dual boot with Ubuntu 14.04 and Windows 8. The upgrade to Windows 8.1 broke my Ubuntu boot, and boot repair disk failed to fix this.
After receiving some comments to my previous question https://askubuntu.com/questions/599650/boot-repair-disk-failed-to-repair-boot-after-windows-8-1-upgrade I decided that it would probably be easier to change my Ubuntu boot to UEFI.
However, when I use boot repair disk and go to advanced options, there is nothing under "Grub location" which is where I need to do this (the tab is also grayed out, but I am still able to click on it). I do have a working EFI partition, since my preinstalled Windows 8 boots fine.