Recovering Ubuntu after installing Windows 7

~ Nguyễn Hoàng Hiệp

By Krishnamoorthy

For Ubuntu 9.10 ( Grub 2) :

I installed Ubuntu Karmic 9.10 some time back. Recently installed Windows 7.

As expected the Ubuntu GRUB boot loader is lost and I had to recover it. Since Ubuntu Karmic uses GRUB 2, the old procedure will not work.

To restore GRUB 2 after installing Windows use the below procedure:

1) Boot the system with Ubuntu Karmic CD

2) STart the console and enter superuser mode with command “sudo -i”

3) Run command “fdisk -l” , to see the partitions available:

In my system:

fdisk -l

// l is character l, not number 1 (in case of misunderstanding)

 Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
 255 heads, 63 sectors/track, 121601 cylinders
 Units = cylinders of 16065 * 512 = 8225280 bytes
 Disk identifier: 0x000d590b
 Device Boot       Start          End      Blocks   Id  System
/dev/sda1 1        4863     39062016   83  Linux
 /dev/sda2             4864      114277    878867955    f  W95 Ext'd (LBA)
 /dev/sda3   *       114278      120806     52436992    7  HPFS/NTFS
 /dev/sda6            11833       12136      2441848+  82  Linux swap / Solaris
 /dev/sda7            18665       82406    512007583+   7  HPFS/NTFS

Identify the Ubuntu root partition. In my case it was “/dev/sda1”

4) Mount root partition in some location

mkdir /media/root
 mount /dev/sda1 /media/root

Replace “/dev/sda1” with your root partition.

5) Install grub:

sudo grub-install --root-directory=/media/root /dev/sda

If you get BIOS warning use the command:

sudo grub-install --root-directory=/media/root /dev/sda --recheck

Then run :(This was me edit from Krishnamoorthy‘s original post )

sudo update-grub2

Now you should be able to see grub after restart.
In case you need to make changes to boot order, change /etc/grub/grub file, then run again :

sudo update-grub2

that will automatically modify the file: /boot/grub/grub.cfg

For Ubuntu 9.04 and older ( Grub ) :

I just installed Windows 7 RC. I already dual boot with Windows XP and Ubuntu Jaunty Jackalope 9.04. In this case, installed Windows 7 over the XP partition.

As expected , Windows overwrites the boot record and only Windows 7 started, hiding the Ubuntu.

I used the following steps from this guide for recovering my Jaunty.

  • Boot using Ubuntu Live CD. 9.04 version in my case
  • Launch the Terminal
  • Issue the command:
sudo grub

In the grub prompt:

grub>find /boot/grub/stage1

Using this information, set the root device (fill in X,Y with whatever the find command returned):

grub> root (hdX,Y)
 grub> setup (hd0)

Reboot. Now you should see the previous grub and boot into Ubuntu.

Sometimes, Windows 7 may not boot from grub. To fix this :

Edit “/boot/grub/menu.lst” ( after booting in Ubuntu )

Add/Edit the section:

title Windows 7 # You can use any title you wish, this will  appear on your grub boot menu
 rootnoverify (hd0,0)
 makeactive
 chainloader +1

You may have to adjust the “rootnoverify (hd0,0)” to  “rootnoverify (hd0,1)” or “rootnoverify (hd0,2)” or “rootnoverify (hd0,3)” so on till it boots Windows.

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