No Boot device found error

prashant.saraf · 11-22-2014, 09:34 PM

Hi,

I have this latop with Windows 8.1 and Ubuntu 14.04 with EFI booting.. working like charme till yesterday. on restart I got error saying no boot device found.
In Bios it shows my ssd details.
On live CD it show hdd but did not show any details about any partsion.

when I try boot-repair command I got below report
http://paste.ubuntu.com/9187103/

I tried this command

sudo dd if =/usr/lib/syslinux/mbr.bin of=/dev/sda
but no fixed

Please help me to fix this.

Thanks
Prashant Saraf

AndrewAmmerlaan · 11-23-2014, 04:48 AM

It looks like boot-repair tries to use fdisk, but you have a gpt partition table, and fdisk doesn't support that. I don't know if ubunut has a boot-repair tool for gpt partition tables, but I do know a method to restore the boot loader

Start a terminal on the live-cd and use the following commands

first mount your partitions

Code:

# mount /dev/sdax /mnt/ubuntu        (replace sdax with your root partition)
# mount /dev/sdax /mnt/ubuntu/boot(if you have a separate boot partition than use this command too, and replace sdax with your boot partition)
# mount /dev/sdax /mnt/ubuntu/boot/efi (since you have efi, you need to mount the efi partition as well)

now mount the proc sys and dev folders

Code:

# mount -t proc proc /mnt/ubuntu/proc
# mount --rbind /sys /mnt/ubuntu/sys
# mount --rbind /dev /mnt/ubuntu/dev

now chroot into your ubuntu installation

Code:

# chroot /mnt/ubuntu /bin/bash
# source /etc/profile
# export PS1="(chroot) $PS1"

now you are typing commands into your ubunut instaltion, so now you can install grub with the following command

Code:

# grub2-install --target=x86_64-efi

now generate a grub config file

Code:

#  update-grub2

this command should detect your ubuntu installation, and add an entry to the grub. reboot, and your ubuntu installation should boot fine.

syg00 · 11-23-2014, 08:24 PM

Note that boot-repair also tried to use parted - which is gpt aware.
None of the above will work as the disk is unusable in that state.

Using dd to force a MBR onto a gpt disk isn't such a good idea - who knows what resulted from that. Might explain the "Error: Can't have a partition outside the disk!" message though.
gpt maintains a secondary partition header at the end of the disk that might be usable for recovery, but that presumes the SSD itself is still usable.

prashant.saraf · 11-23-2014, 11:18 PM

I would not like to risk my data here. can anyone suggest some more options.

Thanks foe Help..

Thanks
Prashant Saraf

yancek · 11-24-2014, 08:08 AM

When using EFI to boot as you were with windows8 and Ubuntu, you should not have boot code in the mbr so using dd to write syslinux boot code to the master boot record didn't help anything. You should have had an EFI partition with both windows and Ubuntu efi boot files. Your boot repair output shows a small part of what is normally shown with that script. Your blkid and parted output don't show any partitions. If you have data on it I would suggest you try to recover it either from the Ubuntu Live CD or something like testdisk.

Were any changes made just prior to this problem occurring?

prashant.saraf · 11-24-2014, 07:31 PM

my windows partions has 10GB left so I did windows disk cleanup
and then powercfg –h off to turn off hibernate.

prashant.saraf · 12-03-2014, 01:52 PM

Can I please get some help here. my HDD is still crashed. Any way to recover data?

AndrewAmmerlaan · 12-04-2014, 03:11 AM

Quote:

Originally Posted by prashant.saraf

Can I please get some help here. my HDD is still crashed. Any way to recover data?

I'm sorry but if you can't access your date using a live-cd, I'm afraid it's lost forever, maybe someone else knows something I don't know, but as far as I know your data is lost.