I have a macbook pro (15 inch, mid 2009) with OSX Yosemite 10.10.3. At first I wanted a dual boot... I have tried: -live disc boot with ubutnu 14.10 -Newly burned 14.10 & 15.04 as well -ubuntu 12.04 (both AMD 64 & intel x86 None of these would boot, so then I installed rEFIt. rEFIt sees the disc only 1/3 of the time and when it does it goes to the white page with the four diamond icon and spits out all of the earlier mentioned discs. I have tried partitioning disc first and then with rEFIt partition tool and nothing is working. At first I was wanting to dual boot but now I am so frustrated I just want my ubuntu back but on my mac machine...please help me get this done...I have asked before and tried the advice, looked at ALOT of other Q&A and nothing is seeming to work. What is wrong. I would love a step by step for an apparent noob like me.