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I followed this guide to install Ubuntu 12.04 on my Macbook Pro 8,2 (late 2011): https://help.ubuntu.com/community/MactelSupportTeam/AppleIntelInstallation

I used a CD.

I synced the partition table on rEFIt, and it went fine.

I do have an icon to boot on Linux, but when I launch it, after a few seconds I have "Missing Operating System" displayed, and that's all...

How can I fix that?

The only thing I see is, in the guide, it is mentioned this:

On the last dialog of the installer, be sure to click the “Advanced” button and choose to install the boot loader (grub) to your root Ubuntu partition, for example /dev/sda3. This will be the only partition with the EXT4 file system.

In Ubuntu 12.04 installation process, there is not such an option, but there is a dropdown menu to select where the grub bootloader should be installed. It was /dev/sda by default, but I selected my root Ubuntu partition (in my case, /dev/sda5). I got a warning message (but actually, it was the same warning message even when I selected /dev/sda), and I continued the installation...

Thanks in advance for your help!

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Before installing Ubuntu uninstalled the other SO? –  Lucio May 7 '12 at 17:42
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4 Answers

Sounds like an issue with Grub, since I don't have a Mac and other UEFI system implementations seem to differ a lot I can just give you a heads up to this wiki page: https://help.ubuntu.com/community/UEFIBooting

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Knowing that the guide can be well-adapted for a dual-boot issue (MacOS/Ubuntu) by removing the windows option for each step that would require to add it.

It worked fine for me (MacOS 10.7.5/Ubuntu 12.04).

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OK, I finally got it working by following this guide: http://ubuntuforums.org/showthread.php?t=1908210

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If you check this link: https://help.ubuntu.com/community/UEFIBooting#Caution_for_Mac_owners , you will find out that the installer is corrupted for mac owners:

Caution for Mac owners

In Ubuntu 11.04 (x86_64 only), due to bug 774089, the ISO CD supports UEFI booting and the Ubuntu installer will try to set up the bootloader for (U)EFI boot. But the installer formats the EFI System Partition to FAT16 (even if the filesystem is non-empty) and also uses efibootmgr, therefore Intel Macs may fail to boot due to corrupted firmware. This feature is not recommended on Mac models because it can corrupt the firmware. You will need to reflash the firmware to repair it. The bug was fixed in Ubuntu 11.10.

On Macs use only the Mac alternate ISO CD

I had the same problem and I had to use the alternate ISO CD to install Ubuntu .

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