How to download YouTube video play list in ubuntu14.04

How to download YouTube video play list in ubuntu14.04 :

You can use Youtube-dlG, a multi-platform GUI for youtube-dl. The GUI lets you download multiple videos at once, can automatically convert downloaded videos to audio, lets you select the video quality and more.

To install it in Ubuntu, you can use the main WebUpd8 PPA:

press ctrl+Alt+t to open terminal

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