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Open your sources.list file in geditWant to share your content on R-bloggers? click here if you have a blog, or here if you don't.
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 E298A3A825C0D65DFD57CBB651716619E084DAB9
Update your sources and upgrade your installation
sudo apt-get update && sudo apt-get upgrade
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