Im surprised to see MBP5.1 users having problems with booting into Ubuntu.
ive run ubuntu successfully for the last three releases when using the 
proprietary nvidia driver


What usually messed things up for me was what card was selected in OSX as the 
active card.
toggling this might be what gets you booted (my macbook has the 9600 and the 
9400 nvidia card) into the installation.

Also , i run my macbook in efi mode nowdays, all works fine except that
one needs to add a more up to date backlight module

adding this to grub console  will disable your 9600 card before booting
into your os and hence save battery.

outb 0x728 2
outb 0x710 2
outb 0x740 2
outb 0x750 0

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https://bugs.launchpad.net/bugs/546393

Title:
  MacBook Pro 5,1 / 5,2 / 5,3 / 5,5 fails to boot into 12.04 desktop

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