Install R and Rattle in Ubuntu 12.04 Precise

Install R
deb http://<my.favorite.cran.mirror>/bin/linux/ubuntu precise/ && sudo apt-get update && sudo apt-get install r-base

If key is required, then
sudo apt-key adv --keyserver --recv-keys E084DAB9

Install the GTK development packages so that R can compile the required packages
sudo apt-get install wajig $ wajig install libgtk2.0-dev libxml2-dev

Install Rattle (R Analytical Tool To Learn Easily)

Startup R and then > install.packages("rattle") > library("rattle") > rattle()

Install the extra packages (yes to all)

Done :)