how to install Spotify Desktop Client in Ubuntu 13.10, Ubuntu 14.04, and Linux Mint...

This simple tutorial is going to show you how to install Spotify Desktop Client in Ubuntu 13.10, Ubuntu 14.04, and Linux Mint.
Spotify for Linux Preview can be installed on currently canonical supported Ubuntu releases from the Spotify repository. This method is recommended as it allows you to automatically upgrade to new releases of Spotify using Ubuntu’s Software Updater/Update Manager tool.


To get started, press Ctrl+Alt+T on your keyboard to open terminal. When it opens, run below command to add the Spotify repository to your system:
 
sudo sh -c 'echo "deb http://repository.spotify.com stable non-free" 
>> /etc/apt/sources.list.d/spotify.list'

Get the key:
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 94558F59

After that, we can install the client after checking for updates:
sudo apt-get update
sudo apt-get install spotify-client

You can also use Synaptic Package Manager to update & install Spotify after added the repository and import the key.