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i have a dual boot between ubuntu 14.04 and windows 8 but i installed windows 7 now i cant boot with ubuntu or windows 8 even the grub cant load the three OS's

Ȝîmǟd
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  • reinstall GRUB ... try [boot repair disk](https://help.ubuntu.com/community/Boot-Repair) and use above [instructions. for commands](http://askubuntu.com/questions/593722/pc-does-not-boot-into-windows-but-ubuntu-still-works-well-how-to-recover/593727#593727) – Madhav Nikam Jun 14 '15 at 12:03
  • but Grub can show just two Os isn't it ? – Ȝîmǟd Jun 14 '15 at 12:14
  • only windows os show? right? – Madhav Nikam Jun 14 '15 at 12:17
  • it shows jus windows7 and ubuntu but the win8 no it doesnt – Ȝîmǟd Jun 14 '15 at 12:30
  • If you have windows 7 disk then boot from disk and use `chkdsk` command it helps you. But at least one time you should try to install GRUB again it better. – Madhav Nikam Jun 14 '15 at 12:38
  • you mean that grub can show 3 os's ??? – Ȝîmǟd Jun 14 '15 at 19:24
  • Yes! you think right now. and I think you should try it first. you still only guess. – Madhav Nikam Jun 14 '15 at 20:43
  • possible duplicate of [How do I install Windows 7 alongside a pre-existing Ubuntu installation?](http://askubuntu.com/questions/92874/how-do-i-install-windows-7-alongside-a-pre-existing-ubuntu-installation) – Maythux Jun 17 '15 at 07:59

1 Answers1

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Two methods for it. 1) Use windows disk and boot from windows7 disk. after that start up repair then open CMD and type chkdsk then restart PC.

2) Install Grub into Ubuntu (not need any bootable disk)

  • sudo grub-mkconfig -o /boot/grub/grub.cfg, if your grub.cfg is at some other location then replace the path in the command with your file location.
  • Type sudo grub-install /dev/sda where sda is my primary HDD having Windows and Linux installed.


restart PC it solve your problem. I recommends you second method to solve problem.

my answer source

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Madhav Nikam
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