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At first I will describe my situation in a few points:

  1. I have installed Windows7, and then Ubuntu 11.04 on my machine. Then everything works fine and at start of system I have screen from linux where I can choose the system.
  2. Then I reinstall Windows7 and install Windows 8 on other partition. Then I can choose between Win7 and win8 when I start system.
  3. Then I need my Ubuntu back so I want restore my bootloader from Ubuntu. I boot Ubuntu from USB and in terminal write this commands:

    sudo fdisk -l

Then I get:

/dev/sda1               1          13      104391   de  Dell Utility
/dev/sda2              14        2805    22425601    5  Rozszerzona
/dev/sda3   *        2805       41968   314572800    7  HPFS/NTFS
/dev/sda4           41968       60802   151282688    7  HPFS/NTFS
/dev/sda5              14        2445    19530752   83  Linux
/dev/sda6            2445        2805     2893824   82  Linux swap / Solaris

Next commands:

sudo mount /dev/sda5 /mnt
sudo mount --bind /dev /mnt/dev
sudo mount --bind /proc /mnt/proc
sudo chroot /mnt
grub-install /dev/sda

I get Installation finished. No error reported.. And when I start my machine I have old Ubuntu start screen to choose system. Ubuntu works well. But There are no Windows 8 option.

But my primary problem is when I choose Windows 7 I have:

error: no such device ...
error: no such disk

so I have no idea what can I do. I really need both systems to work.

Any help would be appreciated.

share|improve this question
up vote 4 down vote accepted

Please boot to Ubuntu and open a terminal. Then execute this command

sudo update-grub

It should solve the problem.

See this question: How can I repair grub? (How to get Ubuntu back after installing Windows?)

share|improve this answer
Thanks a lot! It works :) – Mateusz Rogulski Oct 2 '12 at 14:44

Download this file and put it in an usb with UNetBootin or in a cd by right-clicking on the ISO file and clicking on "write to disc".

Then boot the cd/usb on your computer. It should automatically open, in an lxde GUI, a windows called Boot Repair.

Follow the instructions on the window and when you restart your computer, it should be fine. Hope will help.

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After booting into Ubuntu try these commands in terminal:

sudo add-apt-repository ppa:yannubuntu/boot-repair && sudo apt-get update

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

and follow boot-repair.

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