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I tried to dual boot Ubuntu and fedora, but now I am unable to boot into my Ubuntu installation. Here is the situation I had Ubuntu installed already on /dev/sda2 and I resized it to create another partition /dev/sda3 . I installed fedora 15 on /dev/sda3 . Now I can boot into fedora but there in to option to go into Ubuntu. Swap partition is on /dev/sda1.

Swap /dev/sda1
Ubuntu /dev/sda2
Fedora /dev/sda3
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Fedora 15 still uses grub legacy for boot, and it overwrites Ubuntu's Grub 2 boot loader and menu. And Grub legacy does not find Ubuntu install out-of-the-box.

To restore Ubuntu's boot, all you have to do is re-install grub2.

Do this:

  • Boot using Ubuntu's Live CD
  • Open Nautilus, and double-click Ubuntu's partition. Take note of its mount point directory (if you labeled the partitions, it will be something like /media/label

  • Now open terminal and issue:

    sudo grub-install --root-directory=/media/your-ubuntu-label /dev/sda

  • You may boot into Ubuntu now.

  • If you want to add Fedora 15 to Ubuntu's (grub2) boot list, do this:

    sudo update-grub

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  • This procedure does not work anymore on Ubuntu 13.04 with Fedora 19. Any ideas?
    – Ciro Santilli OurBigBook.com
    Jul 6, 2013 at 14:17
  • Take back my comment, this might have worked, but I had installed fedora on top of an existing partition, and fsck kept trying to mount that because of my fstab.
    – Ciro Santilli OurBigBook.com
    Jul 6, 2013 at 15:01

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