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I have Arch Linux installed on /dev/sda1 (15GB/ext4). / and /boot are both on /dev/sda1 and /home is on /dev/sda2 (100GB/ext4). I made a 15GB/ext4 /dev/sda3 partition for Ubuntu. I installed Syslinux as the bootloader.


How do I dual-boot-install Ubuntu onto /dev/sda3 without installing GRUB, without ruining my Syslinx bootloader and how do I share the home partition /dev/sda2 between the two OS's?


I learned how to boot into Ubuntu correctly and found out that chainloading is unnecessary.

Here's what I did:

  1. Wiped Ubuntu off /dev/sda3 and reinstalled it in the same place.
  2. Made a new directory on /dev/sda1 named /boot/ubuntu,
  3. Copied all of /boot from /dev/sda3 to the new directory in step 1 (because the the kernel and initrd files for Ubuntu were there),
  4. Edited /boot/syslinux/syslinux.cfg from /dev/sda1. See below for the entry:

    LABEL Ubuntu
         MENU LABEL Ubuntu
         LINUX ../ubuntu/vmlinuz-3.5.0-23-generic
         APPEND root=/dev/sda3 ro
         INITRD ../ubuntu/initrd.img-3.5.0-23-generic

If I were smart, I would probably have a dedicated boot partition. Oh well, it wasn't part of the original question so I'll just worry about that later.

However, I was hoping that Ubuntu would use /dev/sda2 as the shared home partition and it didn't :(

Anybody know how to fix the /home/user folder so it's on /dev/sda2?

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migrated from askubuntu.com Jul 4 '13 at 20:32

This question came from our site for Ubuntu users and developers.

Thanks, JasonWRyan. That guide sounds like its for directions if I installed Ubuntu on /dev/sda3 already, which I haven't. Am I supposed to setup syslinux and extlinux this way before I install Ubuntu on /dev/sda3? I'm at the Ubuntu install screen and its asking for me to choose the "Device for boot loader installation." Since I've never installed Ubuntu like this before, I thought it might be a mistake to install another boot loader (GRUB I assume) since I already have one (syslinux). But I don't have the choice not to install a boot loader. – Rhyknowscerious Jul 5 '13 at 4:18
Skip that step and finish the Ubuntu install, and then boot into Arch and configure syslinux to chainload Ubuntu. – jasonwryan Jul 5 '13 at 4:58
I don't think I can skip this step. At this point the installer seems to give me only two choices: 1) Erase everything and install Ubuntu as the only OS, or 2) Install Ubuntu all on a partition of my choice, including the boot loader all on one partition. – Rhyknowscerious Jul 5 '13 at 6:13
You need the alternate install disk to skip grub, apparently... – jasonwryan Jul 5 '13 at 6:26

Install Ubuntu and add /dev/sda2 to your fstab as /home2 any files will be accessible.

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