I can't install packages on ubuntu 12.04

Question

I tried to install packages on the terminal but every time i try it shows this status!! Example i tried to install php-5 and this what it says

sudo apt-get install php5-cli
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package php5-cli

Answer 1

Try running the following commands in a terminal,

sudo apt-get clean
sudo apt-get update
sudo apt-get -f install php5-cli