just had this problem when installing 12.04.2 LTS on a macbook pro 5.5
i could use the default image, but at the grub boot parameters i had to add 
"nomodeset" and remove the "gfxmode $linux_gfx_mode". for debugging purposes i 
removed "quiet" and "splash" earlier to see where it hangs...

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https://bugs.launchpad.net/bugs/911689

Title:
  [precise] [oneiric-alpha1] bootup hangs after ~ 4 secs due to
  nouveaufb  - EFI VGA conflict

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