Ubuntu :: Can't Boot- Bad Hard Drive Or GRUB?

Feb 12, 2010

I've been scouring the forums and Google for 2 days now and am not sure which track I should follow with my problem, because the GRUB path doesn't seem to be working, nor the fsck. I'd appreciate any insight anyone can provide, as I feel I'm spinning my wheels at this stage.A few days ago, I was transferring files from my Ubuntu server via SFTP to my laptop across my local network. All of a sudden, the transfer quit in the middle of transferring a file and since then, I was unable to FTP or SSH in to the server. I hooked up a monitor to see what was going on and there was only a black screen, so I powered off the server and powered back on.

While booting, the Ubuntu logo screen initially appears, but then goes to black and error messages come up, asking me if I wish to start the degraded RAID. "Gave up waiting for root device" is the message I get and it tells me that /dev/md2 does not exist and drops me to a initramfs shell. When I try to start in degraded RAID, it tells me:

mdadm: create user root not found
mdadm: create group disk not found
[49.702561] raid5: failed to run raid set md2
mdadm: failed to run RUN_ARRAY /dev/md2: Input/output error
mdadm: not enough devices to start the array

I have 4 hard drives in the server, configured as RAID 5.I boot from a Live CD and have a look at the discs.All are said to be healthy, except for the 4th which is said to have some bad sectors.I'm unable to access (or don't properly know how to access) the /boot/grub/menu.1st file to change the root delay parameter, which is what I thought I would try first.

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menuentry "Ubuntu Live 8.04 32bit" {
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[code]....

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May 25, 2010

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Code:
Disk /dev/sda: 200.0 GB, 200049647616 bytes
255 heads, 63 sectors/track, 24321 cylinders, total 390721968 sectors

[code]....

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Feb 6, 2010

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Code:
root=/dev/sda2 ro quiet splash
to

[code]...

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[code]....

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Mar 20, 2010

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Jun 19, 2011

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# grub.conf generated by anaconda
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You have a /boot partition. This means that

[code]....

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timeout 30
default 0
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[code]...

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Feb 8, 2010

I am trying to run Ubuntu 9.10 from a USB drive on an old laptop with a dead hard disk.An added complication is that it does not support USB boot, only CD boot.So with the help of URL..., I am running grub from a cd and then booting the kernel from the USB (or something like that).

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Jul 26, 2010

Subject: grub no auto update new hard drive.doc Date: 07/26/2010 03:48:45 PM grub no auto update new hard drive.When installed 11.2 on Western Digital VelociRaptor 150 GB hard drive and now installed 300 GB VelociRaptor drive. Your grub does not update correctly to identity the op systems after the new drive is imaged; youre kidding right? I request that you provide the instruction for correcting this; you must have and auto update for grub.

[Code]...

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Dec 7, 2010

When I first installed the openSUSE, I had to extract whole iso to sda4, because there was some kind of with CD (scratched or something like that), Now I want to add this part to grub, so that when I want to reinstall it, it will be ready for me. I tried doing this with yast, but could't figure out whole thing.

My current setup:
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Feb 8, 2010

I've tried to be clever but as usual I didn't think before acting and missed a small detail.

I have recently installed karmic (dual booting with Vista) on my dell xps laptop. The install went fine, I'm very happy with my new OS.

I bought a new Seagate 500GB portable external HDD. I got a bit over-excited and installed karmic on the external drive. This worked fine and I got a lovely (but slow to appear) Grub2 menu showing my vista and both ubuntu options.

My problem is that now, when I unplug the external drive, Grub fails and I get a grub rescue> prompt. So I need the external drive to be plugged in if I want to boot.

It seems I have done something to the grub configuration. I have read around the subject but I am not confident about how best to proceed.

I understand there is an 'advanced' option in the installer which will allow me to choose where to install grub. Presumably I want it on the internal drive so that I can boot without the external one plugged in.

Am I right in thinking I can just pop in my install disk and redo the installation?

If I indicate I want to install Grub on the internal drive, which partition should I aim for?

Will I get a grub option for booting to the external drive?

Will I be able to plug the external drive into a different machine and boot from it?

I haven't done anything with the fresh install on the external drive so I don't mind losing that.

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