I Cannot load ubuntu with windows 7 [duplicate]

Question

I have installed both Windows 7 and Ubuntu. But today when I turned on my PC it showed an error regarding GRUB RESCUE. So I solved it referring to a site. The site told the following steps:

If you have Windows 7:

• Insert your Windows install disc

• Press any key at the “Press any key to boot from CD or DVD” message to boot from the disc Choose Repair your computer after you select
  the language, time and keyboard method (for Windows 7 users)

• Select your Windows installation drive (usually C:)

• Click Next

• Select Command Prompt in the System Recovery Options window

• Write the following commands in the Command Prompt:

  bootrec /fixmbr
  bootrec /fixboot
  bootrec /rebuildbcd
  

  Press Enter after each command

After doing this steps my Windows 7 started loading without any problem, but I cant boot with Ubuntu now. Please help me with your valuable suggestions.

Answer 1

The process you described appeared to have repaired Windows 7's boot manager which doesn't consider other OSes, just Windows. I don't think you can Boot into Linux with Windows' boot manager.

To have the option for dual boot with the choice of Windows or Linux you'll have to install a boot manager like Grub. Grub is the default Ubuntu boot manager. So what you'll have to do is reinstall Grub. Grub will give you a menu choice of all the installed OSes you have. After you reinstall Grub, you'll have the choice of booting into Windows 7 or Linux.

There are a number of ways to Install Grub.

You can use this method to install Grub on your boot harddrive. This will replace the Windows boot manager:

Boot to a live Ubuntu DVD and use the Try Ubuntu option. From a terminal command run the following:

a) sudo mount /dev/sdaX /mnt # Make "sdaX" the partition that has Ubuntu install (i.e. /dev/sda2)
b) for i in /sys /proc /run /dev; do sudo mount --bind "$i" "/mnt/$i"; done
c) sudo chroot /mnt
d) update-grub
e) if no errors skip this "e" section
     grub-install /dev/sdX (sdX is the hard drive that has linux installed (i.e. /dev/sda)
     update-grub 5) Reboot the system

Answer 2

Boot using a live Ubuntu CD/USB. Install boot-repair using the following commands:

sudo add-apt-repository ppa:yannubuntu/boot-repair

sudo sh -c "sed -i 's/trusty/saucy/g' /etc/apt/sources.list.d/yannubuntu-boot-repair-trusty.list"

sudo apt-get update

sudo apt-get install -y boot-repair && (boot-repair &)

Click on

Recommended Repair

and wait. You will have to be patient as it can can a lot of time.