LinuxQuestions.org - [SOLVED] grub rescue problem

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grub rescue problem

After my failed upgrade of Ubuntu 14.04 from 32 to 64 bit system. My boot no longer worked and when I reinstalled Ubuntu 14.04 64-bit by installing it on the free space available on the same hard drive, I rebooted and it booted into the broken 32-bit boot, which I couldn't use. So I loaded live CD and erased /boot folder from the /dev/sde3 partition that contained my 32-bit broken boot folder, since I figured that the old /boot interfered with the new installation and now the new boot folder that's in the new "formatted" partition /dev/sde4 would take over. But that didn't happen and I was faced with the terminal that said:

Code:

grub rescue>

I am faced with:

Code:

grub rescue>

and when I do:

Code:

grub rescue> ls

I see:

Code:

(hd0) (hd0,msdos6) ... (hd0,msdos1) (hd1) (hd1,msdos1) ... (hd4,msdos1)

I read another post here http://askubuntu.com/questions/49382...untu-partition and I tried for example:

Code:

ls (hd0,msdos6) /boot

but only got:

Code:

(hd0,msdos6): Filesystem is unknown.

I did this for all of the ones listed with the same result.

In the post KillBill says that he

Quote:

... fixed it by login in through a live USB and issuing 'update-grub' command

But I'm not sure how to do that since I have a lot of hard drives and the one that I reinstalled on '/dev/sde'. Would someone know how to go about it, and if so could you explain it in the detailed way how one would go about it?

Hi

grub2 counts hard drives from 0 so its 0,1,2 etc
but counts partitions from 1 so its 1,2,etc

Quote:

(hd0,msdos6) snip /dev/sde4

won't work

dev/sde4 is hd4,4 or hd4,msdos4.

The trouble is, you appear to have deleted the contents of /dev/sde4.

#################################################

so lets start from the beginning.

to go to 64 bit, you need more than 3G of RAM and a processor that can handle 64 bit instructions.

name your CPU please.

Leaping ahead....grub-rescue is not going to work if its booting files are now deleted.
Better off IMHO just doing a clean install.

but a clean install of 32 bit or 64 bit?

you would have to do something like this to get ubuntu to boot

Code:

set prefix=(hd0,6)/boot/grub/i386-pc

set root=(hd0,6)

insmod normal

normal

insmod linux

linux /vmlinuz root=/dev/sda6

initrd /initrd.img

notes;
Change accordingly to fit your needs. If things go really well you will get a grub menu after running the normal command. If things go bad will need a live cd to fix grub.

Quote:

Originally Posted by aus9 (Post 5510825)

Hi

grub2 counts hard drives from 0 so its 0,1,2 etc
but counts partitions from 1 so its 1,2,etc

won't work

dev/sde4 is hd4,4 or hd4,msdos4.

The trouble is, you appear to have deleted the contents of /dev/sde4.

#################################################

so lets start from the beginning.

to go to 64 bit, you need more than 3G of RAM and a processor that can handle 64 bit instructions.

name your CPU please.

Leaping ahead....grub-rescue is not going to work if its booting files are now deleted.
Better off IMHO just doing a clean install.

but a clean install of 32 bit or 64 bit?

OP has two more post that cover this same question. I suggest your look over these too. to get better updated to what is really going on...

http://www.linuxquestions.org/questi...ts-4175573951/

http://www.linuxquestions.org/questi...ve-4175574005/