WAY TO DOWNLOAD VIDEO FROM YOUTUBE USING LINUX

It seems easy to download video from youtube when we use windows but for linux it is some what hard,,but there is solution of many problem in internet.

We use terminal in linux  to download video from youtube and it's URL.Here is some method ,,

sudo apt-get install youtube-dl

youtube-dl  http://www.youtube.com/video/url/ 

But some time we find like this problem..

Retrieving video webpage... done.
Extracting URL "t" parameter... failed.
Error: unable to extract URL "t" parameter.
Try again several times. It may be a temporary problem.
Other typical problems:

* Video no longer exists.
* Video requires age confirmation but you did not provide an account.
* You provided the account data, but it is not valid.
* The connection was cut suddenly for some reason.
* YouTube changed their system, and the program no longer works.

It may be due to mistake in URL  or most probably due to not updted youtube-dl which is requires for download.
You can update it by either

sudo add-apt-repository ppa:nilarimogard/webupd8
sudo apt-get update
sudo apt-get install youtube-dl

Or 

manually download the .deb files if you want.

and than follwing aagin the above mentioned command..

Have once download...