How can you Setup a Static IP Address from command Line.
This is applicable for Debian / Ubuntu and Its Clones
First You have to remove Network Manager .
Then edit the file /etc/network/interfaces with admin privilege
$ gksu gedit /etc/network/interfaces
add the Ip as per your needs ( example I am Going to setup IP address 192.168.0.5):
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
iface lo inet loopback
# This is a list of hotpluggable network interfaces.
# They will be activated automatically by the hotplug subsystem.
# The primary network interface
iface eth0 inet static