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...st(I've actually tryed with 3 different mirrors just in case)sudo gedit /etc/apt/sources.listdeb http://cran.cnr.berkeley.edu/bin/linux/ubuntu/ saucy/ 2) Getting the key step gpg --keyserver keyserver.ubuntu.com --recv-key E084DAB9gpg -a --export E084DAB9 | sudo apt-key add - 3) Run the updates/upgradessudo apt-get update && sudo apt-get upgrade After a large list of succesful updates i get the following result in the terminal: W: Failed to fetch http://cran.cnr.berkeley.edu/bin/linux/ubuntu/saucy/InRelease W: Failed to fetch http://cran.cnr.berkeley.edu/bin/linux/ubuntu/saucy/Release.gpg...