Installing R from CRAN Ubuntu repository: No Public Key Error

Question

I am on R version 2.13 and would like to update to a newer version in order to use some packages that depend on R>= 2.14.

I have the line to my sources.list file as

Answer 1

The simplest solution that worked for me was from Emre Sahin in this thread:

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys E084DAB9