Not able to install ubuntu from USB or CD. I have ubuntu 12.04 installed but I have to reformat my laptop. Neither CD nor USB boots. I want something like that can help me boot.
This process has been tested both in laptops and desktops and the result is a fresh install fully and successfully working.
Step 3 is very important as if you have another OS installed in a local drive the GRUB will notice and record it to be mentioned in the GRUB's options. Additionally, your GRUB can be written in a different hard disk drive. To avoid these issues simply disconnect all the hard disk drives and maintain only the one where you wish your OS to be installed.
I hope this help you.