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Ubuntu on a MacBookPro 8,2

Partition

In OSX, open the Disk Utility, select the main disk. We're going to split this in to two parts. Up to you how much you want to dedicate to OSX. Set the 2nd partition to be "Free Space".

rEFInd

Because Apple is a super-special-snowflake, it's not possible to directly install Ubuntu onto the new partition. We need to first install rEFInd. There are specific instructions for Yosemite.

  1. Download rEFInd.
  2. Extract it onto your Mac.
  3. Open a Terminal and navigate to the directory.
  4. Run this command 
    sudo ./install.sh --esp
  5. We need to edit some files. Still in the Terminal 
    mkdir /Volumes/esp

    then

    sudo mount -t msdos /dev/disk0s1 /Volumes/esp
  6. Edit the file "/Volumes/esp/EFI/refind/refind.conf". Change the line 
    #dont_scan_volumes

    to

    dont_scan_volumes foo,bar
  7. Save the file. When you reboot, rEFInd should ask you which OS you want to boot to.

Get Ubuntu

Probably the easiest bit! Download the 64 bit version of Ubuntu. I used another Ubuntu machine to create the Boot Disk on a USB stick.

Install Ubuntu

Turn your MacBook off, insert the USB drive, turn the device on. All being well, rEFInd will give you a choice of devices to boot into. You probably want the one which says something like

/USB/EFI/grub64

You should see a grub style boot screen. Use the cursor keys to move down to "Install Ubuntu". Do NOT press enter! Press "e" to edit the boot options.

If you don't do this - your screen will be blank. And a black screen will make you sad.

Remove the words

quiet nosplash

and replace them with

nomodeset

. Then press the "F10" key to boot.

You'll be taken through the normal Ubuntu installation screen. It's pretty much just clicking "Next" until it is installed.

Partitions

...With the exception of setting up the partitions!

  • Create a 130MB empty partion. Macs get sad if OSX is bundled up next to a proper OS.
  • Create a 512MB partition and assign it to "/boot"
  • At the end of the free space, create a "Swap" parition. Personally, I use as much swap as there is RAM.
  • With the remaining free space, create a partition and assign it to "/".
  • Which device to you want to boot from? I chose the partition assigned to "/boot" - that way you go straight into Ubuntu when you start the machine. If you ever need to get into OSX, hold down "alt" while turning the machine on.

Keep clicking next! Eventually Ubuntu will be installed and you can reboot!

Setting Up Video

When the grub screen comes up, again you'll need to hit "e" to edit the default boot options.

Scroll down to "load_video" and add these lines below it. I don't know what they mean - it's just magic.

Lorsque l'écran grub apparaît, vous devrez à nouveau appuyer sur "e" pour modifier les options de démarrage par défaut.

 outb 0x728 1
 outb 0x710 2
 outb 0x740 2
 outb 0x750 0

set timeout=5
menuentry "Try Ubuntu without installing" {
   set gfxpayload=keep
   outb 0x728 1
   outb 0x710 2
   outb 0x740 2
   outb 0x750 0
   linux   /casper/vmlinuz  file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash i915.lvds_channel_mode=2 i915.modeset=1 i915.lvds_use_ssc=0 ---
   initrd   /casper/initrd
}

Faites défiler jusqu'à "load_video" et ajoutez ces lignes en dessous. Je ne sais pas ce qu'ils veulent dire, c'est juste magique .

Cela devrait vous démarrer sous Linux. Nous devons maintenant rendre ces changements permanents. Ouvrez un terminal et exécutez

sudo nano /etc/grub.d/10_linux

Appuyez sur CTRL+W pour trouver la ligne contenant "gzio".

Ajoutez ces lignes avant, de sorte que la nouvelle section ressemble à

echo " outb 0x728 1" | sed "s/^/$submenu_indentation/" 
echo " outb 0x710 2" | sed "s/^/$submenu_indentation/" 
echo " outb 0x740 2" | sed "s/^/$submenu_indentation/" 
echo " outb 0x750 0" | sed "s/^/$submenu_indentation/" 
echo " insmod gzio" | sed "s/^/$submenu_indentation/"

Pour appliquer ces modifications, exécutez les commandes suivantes.

sudo update-grub 
sudo apt-get update 
sudo apt-get dist-upgrade

Ventilateurs

Pour une meilleure performance du ventilateur...

sudo apt-get install lm-sensors 
sudo sensor-detect

Répondez oui à toutes les questions. Puis:

sudo apt-get install macfanctld

Redémarrez et profitez d'Ubuntu ! Tout semble "fonctionner" - même si j'écrirai un autre article de blog expliquant comment je l'ai personnalisé.

 

Chroot Grub

Boot with your Live CD, selecting "Try Ubuntu without installing".

Once it boots, open a terminal (ctrl-alt-t) and mount your Ubuntu partition on /mnt. I'm assuming the Ubuntu partition is /dev/sda5, but you should determine this yourself. Let me know if you need help to do this:

sudo mount /dev/sda5 /mnt

Then mount a few more directories that are needed:

sudo mount --bind /dev /mnt/dev
sudo mount --bind /sys /mnt/sys
sudo mount --bind /proc /mnt/proc

Also, if you have a separate Ubuntu boot partition (pretty uncommon these days, but it may be the case):

sudo mount /dev/sdaX /mnt/boot

How can you tell if you have a boot partition?

Once you have your Ubuntu partition mounted, open /mnt/etc/fstab. If you see an entry for /boot, note which device it is pointing to (/dev/sda4 maybe?). This is the one you have to mount.

Once these are mounted, do chroot to start using the mounted directory as the root partition:

sudo chroot /mnt

You'll get a #/ prompt. First thing to do is confirm that you're using the correct /boot directory. Go to /boot/grub and look at the files there. There should be a bunch of .mod files and a grub.cfg file. If the directory is empty, don't continue, because it means this is NOT your actual boot directory. Look above to see how to determine if you need to mount an additional boot directory.

Once you've confirmed that /boot/ contains the correct files, meaning that it is the correct location, type:

sudo update-grub

This should rebuild your /boot/grub/grub.cfg file with the menu entries.

Then exit the chroot:

exit

At this point you may want to check that things were correctly updated. For this, cd /mnt/boot/grub and check that grub's files are there, there should be a bunch of .mod files and grub.cfg, the latter should have entries for your Ubuntu kernels. If you only see grub.cfg and no .mod files, it means that this is NOT the correct boot directory, look above for how to mount a separate boot partition.

Unmount the filesystems:

sudo umount /mnt/dev
sudo umount /mnt/sys
sudo umount /mnt/proc
sudo umount /mnt/boot #Only if you mounted it earlier
sudo umount /mnt/

And then reboot, hopefully your Grub menu will be restored.

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