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?