[SOLVED] Please help me to understand what happened to my bootloader

TroN-0074 · 11-18-2013, 11:43 AM

Computer is dual-booting W7 and Ubuntu 12.04LTS.
Last normal boot was into W7, the user closed the laptops lid and unplugged the power cord. The laptop ran out of battery while W7 was lock under hibernation or sleep mode.
Next boot GRUB error, so cant boot either OS, wha happened here?

I quickly re installed grub by 'chroot'ting the Ubuntu /root partition from a live CD. Reboot the computer and I got the 'grub>' prompt.

I booted into Ubuntu by issuing commands

Code:

grub> search --set=root --file /vmlinuz

Code:

grub> linux /vmlinuz root=/dev/sda1

Code:

grub> boot

Once in Ubuntu I open a terminal and type

Code:

$sudo update-grub

and it acts like it is generating a config file for GRUB but when I reboot I always get the
grub> prompt again.

I will appreciate all advice, thank you

yancek · 11-18-2013, 03:02 PM

Go to the site below and download and run the bootinfoscript. It will give you a lot of details on your partitions, boot files etc.

http://sourceforge.net/projects/bootinfoscript/

TroN-0074 · 11-18-2013, 03:54 PM

Thank you I was able to see all that information. it is showing on this pastebin url http://paste.ubuntu.com/6439733/
I will appreciate all advice.

Thank you.

syg00 · 11-19-2013, 02:35 AM

I would guess Win7 has trampled on some of the "unused" sectors after the MBR (not sector 2). update-grub only regenerates the .cfg - look for grub-install to rebuild the MBR. Or let boot-repair fix it for you (not that I fully trust that).

TroN-0074 · 11-19-2013, 05:09 AM

Thank you. I ran the boot repair tool from Ubuntu and that fixed the problem here is the link to the boot repair https://help.ubuntu.com/community/Boot-Repair