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I installed Ubuntu Minimal 12.04 LTS from USB. Everything was OK. But, when I try to install Grub into /dev/sda, the installation stops with a "fatal error".

So, I just entered /dev/sdb (just tried), Grub got installed without any problem in /dev/sdb.

Then, the installation finished without any problem. But after restart, it says 'grub rescue'.

I had only 1 hard drive. So what is sdb? I thought, USB drive was sda, and my hard drive sdb. Is it possible?

How can I fix it?

UPDATE 1 I tried Boot Repair, but it didn't work out. Here is my Boot Info Summary by "Boot Repair".

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So what is sdb?

I'm afraid that you installed GRUB in your USB.

I thought, USB drive was sda, and my hard drive sdb. Is it possible?

Not always. You had to check first using fdisk -l.

How can I fix it?

With the little information you supplied, I'm afraid that your disk (or just the MBR) is badly damaged. Normally, the GRUB installation are flawless, unless you:

  1. Haven't shutdown Windows or any other installed OS.
  2. Have a dirty NTFS partition.
  3. The disk MBR is damaged.

I recommend you to get a Live system (instead the minimal) and try to repair your GRUB using boot-repair.

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@Braiaim Thank you for replying. I tried boot-repair. First, I run Recommended repair. I didn't work out. After that, I selected Advanced Options. Then, I checked "Purge GRUB before reinstall it" and "ATA Disk Support"(because it says "solves the [out of disk] error"). But it didn't help me. Still got "out of disk" error, and "no device connected". I have Boot Info Summary. Can you inspect it for me? Thanks – Robert 3000 Sep 4 '13 at 6:39
@Robert3000 Can you take an image of this "out of disk"? Also, did you reconfigured the BIOS to boot from disk again? – Braiam Sep 4 '13 at 11:54

I would recommend you to run a live cd of ubuntu and install boot-repair. Open the terminal and copy and paste the following command:

sudo add-apt-repository -y ppa:yannubuntu/boot-repair && sudo apt-get update

After successfully adding and updating the repository type the following command:

sudo apt-get install -y boot-repair && boot-repair

There you can solve your issues related to boot.

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