How to upgrade R in Ubuntu 12.04

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Open your sources.list file in gedit

sudo gedit /etc/apt/sources.list

and add the following line:
deb http://cran.cnr.berkeley.edu/bin/linux/ubuntu/ precise/

Note that you don't have to use that mirror. You may use any mirror from the list here : http://cran.r-project.org/mirrors.html

Add the secure APT key to your system with one command
sudo apt-key adv –keyserver keyserver.ubuntu.com –recv-keys E084DAB9

Update your sources and upgrade your installation
sudo apt-get update && sudo apt-get upgrade

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