How to install R 3.1.2 on Linux Mint 17.1

Question

I have installed the latest version of Linux Mint (17.1) in my computer. I installed R version 3.0.2. However, when I try to install the package xslsx, or dplyr, the system

Answer 1

Hope this will help, your question helped me alot... Note that Linux mint is based on ubuntu trusty...

sudo su
echo "deb http://www.stats.bris.ac.uk/R/bin/linux/ubuntu trusty/" >> /etc/apt/sources.list
apt-key adv --keyserver keyserver.ubuntu.com --recv-keys E084DAB9}
sudo apt-get upgrade r-base
apt-get update
apt-get upgrade