Windows 10 Upgrade - Grub broken during upgrade, Boot Repair does not fix

HI All,

Looking at the forum, it seems as though Windows 10 breaks a lot of grub issues.

Couldn't find anything similar to this one on a search.

I've ran a machine for 10 years on dual boot - Ubuntu 8 I think was where it started.

Just upgraded windows 7 to windows 10 on the machine, now the grub menu is broken (grub rescue prompt)

Downloaded the upgrade fine, installed, rebooted once, fine, logged back in OK, continued the upgrade, rebooted itself and broke the GRUB menue.

Grub repair does not fix this one.

ls (hd0,msdos1) etc returned an error on each one, didn't seem to find an operating system on any drive ("Filesystem is unknown")

Pastebin link from boot repair
http://ift.tt/2al84uG

Had a look at the GRUB wiki, no success:

Looking at the log, it looks as though there is an issue with the bootmgr.

I tried the steps in here, gave directory errors ("no such file or directory," or /mnt/sys does not exist, etc..):

http://ift.tt/1EDN5aN important part below.

Code:

I never got in trouble by using these instructions:
http://ift.tt/2azxyBg 
  First of all, you must start your system from a live cd. Then
  "METHOD 3 - CHROOT
  This method of installation uses the chroot command to gain access to   the broken system's files. Once the chroot command is issued, the   LiveCD treats the broken system's / as its own. Commands run in a  chroot  environment will affect the broken systems filesystems and not  those of  the LiveCD.
  1) Boot to the LiveCD Desktop (Ubuntu 9.10 or   later). Please note that the Live CD must be the same as the system you   are fixing - either 32-bit or 64-bit (if not then the chroot will  fail).
  2) Open a terminal (Applications > Accessories > Terminal).  
  3) Determine your normal system partition - (the switch is a lowercase "L")
  sudo fdisk -l
 If you aren't sure, run  
  df -Th  
  Look for the correct disk size and ext3 or ext4 format.  
  4) Mount your normal system partition:
  Substitute the correct partition: sda1, sdb5, etc.  
  sudo mount /dev/sdXX /mnt  
  Example: sudo mount /dev/sda1 /mnt  
  5) Only if you have a separate boot partition: sdYY is the /boot partition designation (for example sdb3)  
sudo mount /dev/sdYY /mnt/boot  6) Mount the critical virtual filesystems:  sudo mount --bind /dev  /mnt/dev
sudo mount --bind /dev/pts  /mnt/dev/pts
sudo mount --bind /proc /mnt/proc
sudo mount --bind /sys  /mnt/sys  7) Chroot into your normal system device:  sudo chroot /mnt   8) If there is no /boot/grub/grub.cfg or it's not correct, create one using
  update-grub   9) Reinstall GRUB 2:
  Substitute the correct device - sda, sdb, etc. Do not specify a partition number.
  grub-install /dev/sdX   10) Verify the install (use the correct device, for example sda. Do not specify a partition):  
sudo grub-install --recheck /dev/sdX     11) Exit chroot: CTRL-D on keyboard  
  12) Unmount virtual filesystems:
  sudo umount /mnt/dev/pts
sudo umount /mnt/dev
sudo umount /mnt/proc
sudo umount /mnt/sys   13) If you mounted a separate /boot partition:
  sudo umount /mnt/boot   14) Unmount the LiveCD's /usr directory:
  sudo umount /mnt/usr   15) Unmount last device:
  sudo umount /mnt   16) Reboot. 
sudo reboot "

Similar post was this one: http://ift.tt/1EDN5aN

At the moment, I can't break into it.

Have just checked the bios order as well as hinted at in another post. No change.

Any and all assistance that anyone could provide would be greatly appreciated.

With best regards,

Andrew F

WIndows 10 has deleted the Linux ext4 partition as well. My backup's a couple of months old, so I won't lose a lot of information if it's gone. Separate question, I assume it may be recoverable following the steps in the linked post below, but initially, I'm just looking at getting a computer to boot again.
http://ift.tt/2azxAsS
http://ift.tt/l9yvBb

Let's block ads! (Why?)

Windows 10 Upgrade - Grub broken during upgrade, Boot Repair does not fix