Install mahout on ubuntu 12.04 - E: Unable to locate package mahout

Question

How to I install mahout on ubuntu 12.04?

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


https://ccp.cloudera.com/display/CDHDOC/Mahout+Installation
To install Mahout on an Ubuntu or other Debian system:
$ sudo apt-get install mahout

Answer 1

The Mahout installation manual from Cloudera has the following section:

Mahout prerequisites

Important If you have not already done so, install Cloudera's yum, zypper/YaST or apt repository before using the instructions below to install Mahout. For instructions, see CDH3 Installation.

During the CDH3 Installation Cloudera's package repository http://archive.cloudera.com/debian <RELEASE>-cdh3 contrib is being configured in your system, so that after following the manual you shall be able to install mahout using apt-get.