Below you can find some tips on how to check Ubuntu version you are currently running.

The first place to look for Ubuntu version is to look inside /etc/issue file. From terminal run command:

$ cat /etc/issue
Ubuntu Xenial Xerus \n \l

To obtain a Ubuntu release number check content of /etc/lsb-release file:

$ cat /etc/lsb-release 
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu Xenial Xerus

As you may have already notice Ubuntu Xenial Xerus 16.04 Linux Desktop does not come with the ability to login as a root administrator user by default. Every attempt to login as root on a terminal will result in Login incorrect error message:
Ubuntu Xenial Xerus 16.04 root login incorrect.
The reason behind this default Ubuntu Linux desktop behavior is that you rarely need to login as a root user to your GUI desktop. Furthermore, login as root to GUI is highly dangerous and discouraged. The following lines will show you how to gain a root terminal access and how to reset a root password in order to login as root directly.

Using sudo

The recommended way to execute commands as a root user is by using a sudo command. Every time you prefix your command with sudo it will be executed with root privileges. For example the following fdisk -l command with be executed as root. When asked for a password enter your user password:
$ sudo fdisk -l
[sudo] password for linuxconfig: 

The following guide will provide you with some hints and shortcuts on how to open a terminal on Ubuntu Xenial Xerus 16.04 Linux Unity desktop.

Terminal Shortcut

Probably one of the easiest and fastest ways on how to open a terminal on Ubuntu Xenial Xerus 16.04 Linux is by using a keyboard shortcut:
CTRL+ALT+T

Desktop Right-Click Shortcut

The second easiest way is to open your command line terminal by right clicking the desktop screen and selecting "Open Terminal" from the presented drop down menu:
 Ubuntu Xenial Xerus 16.04 open terminal right-click desktop click

zsync is a very handy download tool if you would like to keep your Ubuntu Xenial Xerus ISO image up to date without the need to re-download and entire ISO image every time there was an update. This is especially true with a daily build Ubuntu Xenial Xerus ISO images or if you have a limited download speed or bandwidth. In this case thezsync will allow you to download only that part of the ISO image which has been changed since your last download.

Prerequisites

To get begin let's start by installation of zsync package:
# apt-get install zsync

The following linux commands will assist you with network restart procedure on Ubuntu 16.04 Xenial Xerus Linux. We will start with the most recommended commands and move down to more obscure or obsolete commands in case the above commands will fail from some reason. Let's begin with system and service manager by using systemctl command to restart network service:
$ sudo  systemctl restart NetworkManager.service
Next command service will restart a relevant networking System V init script:
$ sudo service network-manager restart

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