I keep getting asked how I download and convert youtube and other videos, so I offer you this tutorial. You will need Ubuntu 6.06 or higher (this was done on 7.10), as I haven't attempted this with anything lower. I refer to Mozilla, but any Mozilla derivative, such as FireFox, will work. All Terminal COMMANDS will be in red. You will need to have ffmpeg installed. Open up your Synaptic Package Manager... Type in your password to access the Manager... Type in ffmpeg... Click on the box, and mark it for installation... Click Accept, to confirm installation... Good. Now close...