Recover Grub

I installed Windows 7 on my old laptop, which already had Ubuntu installed. As expected, I lost the boot manager (Grub2).

1. Boot from an Ubuntu live CD. In a previous post I explained how to create a live USB.

2. Find out the /boot partition (here it is /dev/sda6):

   ubuntu@ubuntu:~$ sudo fdisk -l
   /dev/sda6            3984        3996       96256   83  Linux
   

3. Mount this partition

   ubuntu@ubuntu:~$ sudo mkdir /media/boot
   ubuntu@ubuntu:~$ sudo mount /dev/sda6 /media/boot
   

4. Reinstall Grub

   ubuntu@ubuntu:~$ sudo grub-install --boot-directory=/media/boot /dev/sda
   

5. Restart the computer and log in to Ubuntu.

6. Add Windows and all other operating systems to the grub menu

   julio@julio-acer ~> sudo update-grub2
   [sudo] password for julio:
   Generating grub.cfg …
   Found linux image: /boot/vmlinuz-2.6.38-8-generic-pae
   Found initrd image: /boot/initrd.img-2.6.38-8-generic-pae
   Found memtest86+ image: /memtest86+.bin
   Found Windows 7 (loader) on /dev/sda1
   done
   

Links

• https://help.ubuntu.com/community/RecoveringUbuntuAfterInstallingWindows