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So I had the perfect Ubuntu 12 / Windows 7 dual boot set-up -- until I had to re-install Windows 7.

After the deed, GRUB2 was of course wiped out, thus my Ubuntu installation is rendered inaccessible.

I have tried these steps:

mount /dev/sda5 /mnt   #This is where my Ubuntu installation resides.
mount /dev/sda1 /mnt/boot #Indicated by the `*` under `Boot` when doing `fdisk -l`
mount --bind /mnt/proc /proc
mount --bind /mnt/sys  /sys
mount --bind /mnt/dev  /dev
sudo chroot mnt
sudo grub-install /dev/sda
sudo update-grub
#Then unmounted everything...

Unfortunately, only my Windows 7 has been detected and the Ubuntu entries never appeared in the prompt. Only my Windows 7 installation (/dev/sda1) is available in the GRUB2 menu.

How can I rectify this?

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Boot-Repair is a great graphical and automatic utility to restore grub.

Try to use the 2nd option cuz is more quick.

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I've been meaning to use this but opted not to. I have quite a specific set-up and I'm not quite sure which options to specify as to not ruin the Windows boot loader. – Bez Hermoso Oct 17 '12 at 23:39
But you must "ruin" the Windows boot-loader. You have to replace it with Grub. You attempted to (in your original question) but failed. So try with this automatic tool. – NikTh Oct 18 '12 at 5:57

Short Answer: You don't need to mount sda1 unless it contains your Linux boot folder. An easy way to check is to look at /etc/fstab after you chroot (or /mnt/etc/fstab before).

See if that makes any difference.

Long answer: If sda1 is your Windows partition, mounting it to /mnt/boot will essentially hide your Linux boot files and so grub won't find them.

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