Ubuntu installation problem

[Azsde]

Hello,

I've recently upgraded my Macbook Pro with a SDD and I tough I'd make a fresh install to have my triple boot running smoothly.

So far here's what I've done :

• Installed OS X Yosemite on my new SSD.
• Installed windows 8.1 with bootcamp assistant
• Created a third partition between my Mac OS X one and windows 8.1 one with the disk utility
• Installed refind on esd (because I'm using Yosemite)
• Fixed the slow boot time by using fallback filename (renaming refind folder to BOOT and refind_x64.efi to bootx64.efi)
• Installed Ubuntu 14.04 on the third partition and making sure that the bootloader is also installed on the same partition.

But it turns out that Ubuntu decided to install some files into my /ESP/efi folder. So whenever I start my mac, it seems that Ubuntu has like a priority over rEFInd and my mac starts on Ubuntu instead of displaying the rEFInd screen.

So I have to hold down the alt key in order to get to refind, and when i'm in refind, ubuntu is not detected as it used to be on my old setup, it says : "Boot EFI\ubuntu\grubx64.efi"

(See attachement)

Video demontrating the problem : http://youtu.be/-i43EqEctMA

So i thought that maybe Ubuntu placed unescessary files in this foldr, so i tried to delete them, now refind is displayed at the boot of my mac, but ubuntu is not detected, only mac os x and windows ...

Any help installing ubuntu would be appreciated !

Thank you in advance.

Regards,

Azsde.

[Azsde]

Okay guys, I don't know at all why this is different now, but installing with a optic support (CD) instead of a USB solved my issue ...

Edit : Ubuntu messed up my windows ...

Edit 2 : I gave up the idea of having the 3 operatig systems on my SSD, I set up mac and windows on the SSD and ubuntu on my HDD that replaced my optical drive.

[Roderick W. Smith]

Triple-booting is tricky on any computer, and that aplies double on a Mac. Chances are you were running into problems relating to one or both of the following:

• Hybrid MBRs -- A hybrid MBR is an ugly and dangerous hack that Apple uses to enable Windows to boot. Hybrid MBRs can be avoided with some versions of Windows on some Macs. (Windows 8 is best in this respect.) If possible, I recommend avoiding hybrid MBRs, but it's not always possible; and even when it is, it takes some study to figure out how to do it. For your situation, Apple's tools normally add only the first three partitions after the EFI System Partition (ESP) to the MBR side, which means that your Windows partition must be one of these early partitions. It's not clear if Windows was in this privileged location in your case. You can use other tools, such as gdisk or the gptsync utility that comes with rEFInd, to do it more flexibly, but it's ugly even then.
• Using GRUB -- It sounds like you installed an EFI-mode version of GRUB, which is fine in and of itself, except that GRUB then took over from rEFInd. You probably could have gotten it working by re-installing rEFInd from OS X. Removing GRUB and installing an EFI filesystem driver might have helped further, although there are subtleties to removing GRUB. (In brief, Ubuntu would try to re-install it.) A BIOS-mode GRUB installation wouldn't be any better, since that could complicate the task of booting Windows.