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I had installed windows 7 and ubuntu 12.04 side by side using dual boot.

Recently I reinstalled my windows and the grub menu disappeared .I ran a boot repair from my ubuntu live cd to reinstall grub but it is still not showing ubuntu but only windows in grub

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1.Install EasyBCD software on windows
2.Create a boot entry for your ubuntu partition
3.After Restart select ubuntu from the grub
4.You will be get back into Ubuntu 12.04.

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It looks like the root cause of the problem is that you have a separate /boot/ partition which was at one point properly configured in your /etc/fstab but you (or some other person/script) commented out the fstab entry for this /boot/ partition. This can be seen by this line in your /etc/fstab from sda9: #UUID=3a7e4da4-1e7c-4c01-9b8b-b2a7248c62f5 /boot ext4 defaults 0 2

I don't know why this is commented out, but it appears to be a mistake. This caused your grub.cfg not to contain any entries for Ubuntu because update-grub creates an entry for each kernel found in /boot/, since your /boot/ partition wasn't mounted you didn't have any kernels in /boot/ and thus no Ubuntu entries were made.

To fix this from a LiveCD/USB, first mount the partition containing your Ubuntu installation's root filesytem: sudo mount /dev/sda9 /mnt/ then edit your fstab: gksudo gedit /mnt/etc/fstab. That last command should open your fstab in gedit, find the line #UUID=3a7e4da4-1e7c-4c01-9b8b-b2a7248c62f5 /boot ext4 defaults 0 2

and uncomment it (remove the '#' character from the beginning of the line) then save your changes and exit gedit.

With your fstab fixed, you can now re-install grub and you should get options for both Ubuntu and Windows at boot. Using boot repair to re-install grub will probably work, but I would personally recommend following this guide instead:

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Run Boot-Repair, update it, click Recommended Repair. Done.

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