To change an ubuntu system to fixed IP address after installing as DHCP.

1- Edit /etc/network/interfaces to look like this, with the proper
   substitutions:

------------------------------------------------------------------------------
# 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 144.38.210.130
        netmask 255.255.224.0
        network 144.38.192.0
        broadcast 144.38.223.255
        gateway 144.38.192.1
        # dns-* options are implemented by the resolvconf package, if installed
        dns-nameservers 144.38.192.2 144.38.192.3
        dns-search utahsg.org
------------------------------------------------------------------------------

2- Edit /etc/hosts to look like this.  Again, use proper substitions:

------------------------------------------------------------------------------
127.0.0.1	localhost
144.38.210.130	ns1.utahsg.org	ns1

# The following lines are desirable for IPv6 capable hosts
::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts
------------------------------------------------------------------------------

3- Check that /etc/hostname contains the hostname you wanted for you machine.