This following guide will show you how to install Spotify client onUbuntu 16.04 (Xenial Xerus ) LTS 64-bit Linux. First, we start by adding a spotify repository:
$ sudo echo 'deb http://repository.spotify.com stable non-free' >> /etc/apt/sources.list
Execute the below command and import non-expired key. Most likely your numeric selection will be 1 as shown below:
# gpg --keyserver hkp://keyserver.ubuntu.com --search-key 'Spotify Public Repository Signing Key'
gpg: data source: http://91.189.89.49:11371
(1)     Spotify Public Repository Signing Key 
          4096 bit RSA key EFDC8610341D9410, created: 2017-07-25, expires: 2018-07-25
(2)     Spotify Public Repository Signing Key 
          4096 bit RSA key 13B00F1FD2C19886, created: 2015-05-28, expires: 2017-11-22 (expired)
(3)     Spotify Public Repository Signing Key 
          2048 bit RSA key 082CCEDF94558F59, created: 2012-06-25, expires: 2015-06-25 (expired)
(4)     Spotify Public Repository Signing Key 
          1024 bit DSA key 4F9946354E9CFF4E, created: 2010-06-23, expires: 2012-06-22 (expired)
Keys 1-4 of 4 for "Spotify Public Repository Signing Key".  Enter number(s), N)ext, or Q)uit > 1
gpg: /root/.gnupg/trustdb.gpg: trustdb created
gpg: key EFDC8610341D9410: public key "Spotify Public Repository Signing Key " imported
gpg: Total number processed: 1
gpg:               imported: 1
To confirm, hence list all imported keys run:
# gpg --list-keys
/root/.gnupg/pubring.kbx
------------------------
pub   rsa4096 2017-07-25 [SC] [expires: 2018-07-25]
      0DF731E45CE24F27EEEB1450EFDC8610341D9410
uid           [ unknown] Spotify Public Repository Signing Key 
Next, update packages index:
$ sudo apt-get update

The following guide will provide an information on how to install SSH Server on Ubuntu 16.04 Xenial Linux. SSH Server uses the secure shell protocol to accept connections from remote clients.

Let's start by installation of SSH package:
$ sudo apt-get install ssh

The following config will discuss an installation of Skype on Ubuntu 16.04 Xenial Xerus 64-bit Linux.

Install from Ubuntu Partner Repository

Below commands will install Skype from Ubuntu's partner repository:
$ sudo add-apt-repository "deb http://archive.canonical.com/ $(lsb_release -sc) partner"
$ sudo dpkg --add-architecture i386
$ sudo apt-get update
$ sudo apt-get install skype
Skype should now be installed on you Ubuntu 16.04 system. Use Ubuntu's application menu to start Skype or start Skype directly from your terminal:
$ skype

Manual install

Start manual Skype installation by downloading the latest official skype ubuntu package from http://www.skype.com/en/download-skype/skype-for-linux website.

Alternatively use the wget command below to download Skype Ubuntu package directly from command line. Please not current version of skype may be different:
$ wget http://download.skype.com/linux/skype-ubuntu-precise_4.3.0.37-1_i386.deb
Since we are trying to perform an installation of i386 package on 64-bit system we need to enable multi-architecture to support both platforms:

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$ sudo dpkg --add-architecture i386
$ sudo apt-get update

This short config will show you how to install Spotify client on Ubuntu 14.04 LTS Linux. Let's start by adding a spotify repository:
echo 'deb http://repository.spotify.com stable non-free' >> /etc/apt/sources.list
apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 13B00F1FD2C19886
apt-get update

This article will describe multiple procedures on how to install various GUI desktop environments on Ubuntu Linux 14.04 LTS (Trusty Thar). The article assumes that no desktop manager nor display manager is currently installed on your system. Furthermore, If the display manager needs to be installed explicitly we will install lightweight XDM. In case that you require different display manager simply replace xdm package listed in below commands with some alternatives such as GDM, KDM, lightdm etc.

UNITY

$ sudo apt-get install ubuntu-desktop
How to install unity desktop on ubuntu linux

GNOME

$ sudo apt-get install ubuntu-gnome-desktop
How to install gnome desktop on ubuntu linux

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