I am attempting to install Ubuntu on my Macbook Pro, but when I attempt to download the Mac desktop image (as opposed to the regular 32bit or 64bit edition) from the normal Ubuntu websire, I am given a 404 Error from all mirrors. It seems this image does not exist for 14.04. I have found the image for 14.10, but I would prefer to use a LTS edition. Does anyone know where I can find this image?