As of Ubuntu 12.04, we cannot edit /etc/resolv.conf directly anymore, so we need to add nameservers directly into network configuration.

This is a must save for later.

Setting a static IP in Ubuntu 12.04:

1 – Edit etc/network/interfaces

nano etc/network/interfaces

# 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
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet static
        address 192.168.1.13 
        netmask 255.255.255.0
        gateway 192.168.1.1 #change this according to your network settings
        dns-nameservers 8.8.8.8 8.8.4.4 #google dns

2 – Restart network

/etc/init.d/networking restart

That’s it, you should now have a static IP.