I have a Macbook Pro 4,1 It has a 64 bit Intel chipset. I download Ubuntu-11.10-amd-64.iso
I have verified that macbook iso md5sum and the cd boots to the live CD mode too. The installation completes upto 60% and then fails with the following dialog.
I am not sure if this a problem with CD has I have tried a couple of times and it has failed with a different CD at a different point in time.