Add static IP on Ubuntu

edit --> /etc/network/interfaces

auto lo

iface lo inet loopback

auto eth0

iface eth0 inet static

address [ip address]
netmask [subnet mask]
broadcast [x.x.x.255]
gateway [ip gateway]
then
edit --> /etc/resolv.conf

nameserver [dns ip]
nameserver [external dns ip]
done

/etc/init.d/networking restart <-- restart network