from a command line prompt, enter :
sudo add-apt-repository ppa:ubuntu-x-swat/r-lts-backport sudo apt-get update sudo apt-get install linux-generic-lts-raring
from a command line prompt, enter :
sudo add-apt-repository ppa:ubuntu- x-swat/ r-lts-backport lts-raring
sudo apt-get update
sudo apt-get install linux-generic-