I have never installed an OS before.
I upgraded to 13.04 and it has been a total disaster. I now want to go back to 12.04.2, but will have to install it totally. I tried following the instructions, but the computer doesn't do anything that instructions tell me to do.
I have downloaded it to a flash drive, but there seems to be no starting point that I can identify.
Where do I start?
Also, is it possible to download it directly from the hard drive, or does it have to be from an external source?
Thank you.