+ - sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys E084DAB9
+ - echo "deb https://cran.rstudio.com/bin/linux/ubuntu trusty/" | sudo tee -a /etc/apt/sources.list
+ - sudo apt-get update -y
+ - sudo apt-get install -y r-base
+ - sudo Rscript -e "install.packages('knitr', repos = 'https://', dependencies = TRUE)"
+ - sudo Rscript -e "install.packages('stringr', repos = 'https://cran.rstudio.com', dependencies = TRUE)"
+ - sudo Rscript -e "install.packages('checkpoint', repos = 'https://cran.rstudio.com', dependencies = TRUE)"
+ - sudo Rscript -e "install.packages('ggplot2', repos = 'https://cran.rstudio.com', dependencies = TRUE)"