How to Installation of gns3 on Ubuntu?

One of the most popular and useful simulators, GNS3 Linux is quite easy to install under. Installation is even easier because it has a bundled archive available for Ubuntu.
First, let’s install the package archive.
techsoftcenter:~$ sudo add-apt-repository ppa:gns3/ppa
PPA for GNS3 and Supporting Packages. Please see http://www.gns3.com for more details
More information: https://launchpad.net/~gns3/+archive/ubuntu/ppa
Press [ENTER] to continue or Ctrl-C shortcut to cancel insertion.
gpg: `/tmp/tmp_fqu7qvl/secring.gpg' key chain created
gpg: `/tmp/tmp_fqu7qvl/pubring.gpg' key chain created
gpg: A2E3EF7B switch keyserver.ubuntu.com server is requested from hkp
gpg: /tmp/tmp_fqu7qvl/trustdb.gpg: assurance database created
gpg: anahtar A2E3EF7B: public key "Launchpad PPA for GNS3" received
gpg: Total amount processed: 1
gpg: received: 1 (RSA: 1)
OK
Now update the package archive
techsoftcenter:~$ sudo apt-get update
Let’s install GNS3.
techsoftcenter:~$ sudo apt-get install gns3-gui
Reading package lists ... Done
Generating the dependency tree
Reading status ... Done
The following additional packages will be installed:
cpulimit gns3-server iouyap lib32z1 vpcs
The following NEW packages will be installed:
cpulimit gns3-gui gns3-server iouyap lib32z1 vpcs
0 packages will be upgraded, 6 new packages will be installed, 0 packages will be removed and 3 packages will not be upgraded.
13.7 MB archive file will be downloaded.
68.8 MB of additional disk space will be used after this process is completed.
Do you want to continue? [E / h] E
It’s that simple. we can now run GNS3.
techsoftcenter:~$ gns3
GNS3 GUI version 1.3.11
Copyright (c) 2007-2015 GNS3 Technologies Inc.
2015-11-28 18:56:43 INFO main.py:222 Log level: INFO
2015-11-28 18:56:43 INFO servers.py:79 New local server connection http://127.0.0.1:8000 registered
2015-11-28 18:56:43 INFO __init__.py:206 VPCS module reset
2015-11-28 18:56:43 INFO __init__.py:404 Dynamips module reset
2015-11-28 18:56:43 INFO __init__.py:287 IOU module reset
2015-11-28 18:56:43 INFO __init__.py:308 VirtualBox module reset
2015-11-28 18:56:43 INFO __init__.py:255 QEMU module reset
2015-11-28 18:56:43 INFO __init__.py:69 Built-in module reset
2015-11-28 18:56:43 INFO topology.py:382 Topology reset
Now we have finished installing gns3 gui in our Ubuntu operating system.
