How to install GNS3 2.0.3 on Ubuntu 16.04, 17.04

    GNS3 is an open-source software used by network engineers to simulate, test and troubleshoot a virtual as well as real network environment. It enables you to run a small network topology that consists of networking devices such as laptops, desktops, servers, switches, routers, etc. Before we proceed on how to install GNS3 on Ubuntu, lets take a quick look at its uses.

GNS3 2.0.3 Changelog:
Gui

•     Display error when we can't export files
•     Fix auth header not sent is some conditions
•     If we have auth issue at server startup continue to get better error
•     Do not override IOU configuration file when you change the image
•     Fix some PNG loading issues on Windows
•     Handle label with missing elements
•     Support floating value for font size
•     Handle partial json in a response
•     Add Dominik as a new team member

Server

•     Fixes #1068 - handle zipfile encoding issues at project duplication
•     Fix: #1066 - Catching parsing errors at linked vbox file
•     Ignoring virtualenv directory at gitignore
•     Escaping VPCS name in regex
•     Fix racecondition when listing interface
•     Fix Qemu disk creation with unicode characters not supported by local filesystem
•     Fix when config file doesn't have computes section
•     Check aiohttp version

Installation instructions: 
 
We can add this PPA to Ubuntu Operating  Systems and install GNS3 with few easy commands.

Open terminal and insert command line...

$ sudo add-apt-repository ppa:gns3/ppa $ sudo apt-get update $ sudo apt-get install gns3-gui

 
Option, remove GNS3

$ sudo apt-get remove gns3-gui

   
refer original : https://howto-ubuntunew.blogspot.com/