Cant upgrade R in ubuntu 14.04

On 08 Aug 2015, at 06:31 , boredstoog via R-help <r-help at r-project.org> wrote:


I am trying to install R programming language and able to install rbase
using this code without adding repository in *source.list*

sudo apt-get install r-base

After that i tried to upgrade it using this code

sudo add-apt-repository ?deb
http://star-www.st-andrews.ac.uk/cran/bin/linux/ubuntu/trusty/?
sudo apt-get update
sudo apt-get upgrade

But when i tried the first code

sudo add-apt-repository ?deb
http://star-www.st-andrews.ac.uk/cran/bin/linux/ubuntu/trusty/?

its giving this error

Error: need a single repository as argument





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