Here is the simple step by step process of how to Download Youtube Playlist in Ubuntu. The following method makes it very easy to download entire playlists onto your system.
For this we use the command line tool youtube-dl.
To install youtube-dl use the following commands:
$ sudo apt-get update
$ sudo apt-get install youtube-dl
To download an entire channel use the command:
youtube-dl -citw ytuser:
To download all videos on a playlist use the below command followed by the playlist url: