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Hi I have updated my dell T7500 desktop to Ubuntu 12.04 and when I tried to reboot I got grub rescue mode.

I have booted to live cd and used boot repair as instructed here:

At first I tried default repair but it didn't solve the problem, here is the first paste:

Then I tried many options like purge grub, install it on only one partition (I tried several options) and at the end I did a default settings repair again and after this last one only windows boots automatically and I don't even get a choice of OS.

Here is my last paste:

I don't know what else to do, I don't want to reinstall, how could I fix this? thnks

EDIT: I had also tried following these instructions on grub rescue Recovering from 'grub rescue>' crash but unfortunately it says something about linux not found

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Could you try removing boot flag from 1st drive of windows using gparted (live CD)? So it will boot from next drive (linux partition) – Sneetsher Jan 16 '14 at 20:41
I don't know how to do that, but will try, I hope it will not mess up my ubuntu partitions – vallllll Jan 16 '14 at 22:09
In gparted after selecting windows harddrive > right click on that NTFS partition which have boot flag > label > un-check boot – Sneetsher Jan 16 '14 at 22:39
Thanks Sneetsher I have found it was select line to modify then menu option devices / manage flags and then I unticked boot – vallllll Jan 17 '14 at 16:02
up vote 1 down vote accepted

Using gparted of live CD, remove 'boot flag' from first drive (Windows partition). So the machine will boot from next drive (Ubuntu partition which already is boot-able).

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