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I was trying to do something with dd command in Ubuntu's terminal. But I screwed up. I don't really remember what the command was.

But after I ran it, I restarted the PC and I read a message "No operating system found".

So as I wanted to install the new Ubuntu, 11.04, I just picked up a bootable pen drive with that OS and tried to install it. I wanted to completely clean the hard drive and make a fresh install. How ever when I try to do this, in the middle of the installation an error message pops up and it says that there was an error installing GRUB.

I don't have anything else in the hard drive, no particions and only one disc. What can I do?

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Take a rescue CD like Knoppix and clean the disk with dd:

dd if=/dev/zero of=/dev/sda bs=1024000

Use /dev/hda for older systems. After this initialize the partition table with fdisk. After that try to install Ubuntu.

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I am going to try that and tell the results in here. Thank you! – petermlm May 8 '11 at 17:40
It worked without problems. Thank you very must! – petermlm May 8 '11 at 18:09
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