Ubuntu 14.04 dual boot 10.9(USB Install)

Hi everyone

Im new to the forum. Not very new to Linux but not a pro ;-)

Im trying to get the new 14.04 to load on my iMac 24" (7,1)

Any advice on how to if the SUPERDRIVE is not working anymore?

I've followed this thread:
http://ubuntuforums.org/showthread.p...29#post7926629

Problem is the grub is designed for 9.04 and wont boot 14.04.
Maybe there is a new grub for what I need?