[ubuntu] I can't get Ubuntu 12.04 or 13.04 to boot on Macbook Pro 9,2

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http://ubuntuforums.org – Hello everyone, I have been trying for the last 3 days to get ubuntu to work on my notebook, a macbook pro 9,2 (with ssd if that makes any difference). I have no problem with the installation as I made it install from USB stick or directly from the Live CD, both 12.04 and 13.04. The problem is, that after the install, when I try to boot into ubuntu using the refit menu, after i select the Linux partition to boot from, I only get the penguin logo and after that just a black screen (sometimes with a blinking cursor, sometimes not). I have followed several threads on this blinking cursor problem (Hardware)