prea.net

Basic install: aptitude install r-base. On Lenny it installs R 2.7.1
To have the latest R, according to CRAN, add to your apt sources list the unstable repository, and use apt-pinning. Additional packages:

• multicore^†
• matlab^†
• ruf^‡
• snow, snowfall and related dependencies^†,*

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^*test install, decide if keep as standard or remove.
^†non-debianized package, installed via install.packages.
^‡non-debianized nor CRAN package, look at http://csde.washington.edu/~handcock/ruf/.