How to downgrade to R 2.4.0-0sarge2 under Ubuntu 7.04

add to /etc/apt/source/list deb http://people.debian.org/~cts/R/debian sarge/
sudo apt-cache policy r-base
sudo apt-get install r-base=2.4.0-0sarge2 r-base-core=2.4.0-0sarge2 r-recommended=2.4.0-0sarge2
suro apt-get update
sudo apt-get install g77 build-essential refblas3-dev refblas3
install.packages('setRNG', dependencies=T)
go to : http://cran.r-project.org/src/contrib/Archive/D/ and take the archives. Use them.