Good night,

If you want to install DHCP server in Ubuntu, use

$ sudo apt-get install dhcp3-server

And then edit /etc/dhcp3/dhcpd.conf I commented all lines and add this ones:

INTERFACES="eth1"; # INTERFACE CONECATADA AO MEU ROTEADOR
ddns-update-style none;
default-lease-time 600;
max-lease-time 7200;
authoritative; # DHCP PRINCIPAL DA REDE

subnet 192.168.0.0 netmask 255.255.255.0 {
range 192.168.0.100 192.168.0.150; # FAIXA DE IPS A SER DISTRIBUIDA
option routers 192.168.0.254; # GATEWAY
option domain-name-servers 200.247.141.11; # SERVIDOR DNS
option subnet-mask 255.255.255.0; # MASCARA DE SUBREDE
option broadcast-address 192.168.0.255; # ENDEREÇO DE BROADCAST
default-lease-time 600;
max-lease-time 7200;
}

Restart eh DHCP server:

$ sudo /etc/init.d/dhcp3-server restart

See you,
Matheus

Reference:
Google + DHCP SERVER UBUNTU