Take the 2-minute tour ×
Ask Ubuntu is a question and answer site for Ubuntu users and developers. It's 100% free, no registration required.

I have been running Windows 8 on a different partition, alongside Ubuntu 12.04, working fine.

After running sudo apt-get upgrade the Windows 8 partition can't boot. I can still see Windows 8 (on dev/sda3, which is correct) in the grub menu, but when selected I see a black screen flash and the grub menu reappears within a couple of seconds.

I tried repairing with boot-repair which has always solved my grub issues, but this time it changes nothing.

FWIW here is a BootSummary http://paste.ubuntu.com/5945338

share|improve this question
add comment

3 Answers 3

Do you have a Windows repair disk? Perhaps BOOTMGR (the Windows Vista/Seven/Eight bootloader) has become damaged.

If you have a repair disk, I would try using the automatic repair utility to fix the bootloader.

If you don't have a repair disk, I would try booting from Hiren's Boot CD, running BootICE, and overwriting your Windows drives' PBR (partiton boot record) with BOOTMG. You can do this by selecting your hard drive from the dropdown list, and clicking Process PBR on the bottom of the Window. Unfortunately, I you can download Hiren's Boot CD from HERE.

Please note, you may have to disable UEFI to boot Hiren's. Also, If you have SATA, you may have to enter you BIOS/UEFI settings, and set your SATA controller to emulate an IDE controller. Otherwise, you might not be able to access your hard drives from the CD at all. After you are finished with he CD be sure to set your BIOS/UEFI settings back to whate they were before, or else Windows/Ubuntu might get confused by the changes, and fail to boot.

share|improve this answer
add comment

If you are still trying to use the system as a dual boot system, you can go to http://neosmart.net/EasyBCD/ and download that program and you will be able to edit you master boot record.

share|improve this answer
add comment

Solved by following https://help.ubuntu.com/community/BootSectorFix

Basically, use the testdisk program from a Live (USB/CD) environment to fix the Windows partition boot sector.

share|improve this answer
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.