How the fuck do I make Grub boot in UEFI? I want to select my Linux but this niggers don't let me.
Absolute bullshit. Have been running multiple distro's on my UEFI laptop for the last 2 years. Only difference I've experienced is faster boot times, and if you install refind or gummiboot you get a pretty bootloader also.
Press f8 at startup then choose your hard drive with loonix. If you have all on same drive and have fucked up your master boot record download both Windows repair disk and rescatux grub repair disk and that should help you with any boot up errors
Shouldn't matter what distro you're using, I got grub working on my rMBP by mounting the EFI partition and using grub-install and grub-mkconfig.
You might also want to read the man page on efibootmgr.