Install Cacti in ubuntu 14.04

# apt-get update
# apt-get upgrade
# add-apt-repository 'deb http://archive.ubuntu.com/ubuntu trusty universe'
# apt-get update
# apt-get install apache2 mysql-server-5.6 php libapache2-mod-php
# apt-get install snmp snmpd rrdtool
# apt-get install cacti cacti-spine

# service snmpd restart
# service mysql restart
# service apache2 restart

http://your-server_ip-address/cacti