R is a programming language and environment for statistic data analysis and their graphical display. It is an implementation of programming language S under free license GNU General Public License. R can be expanded via libraries called packages. Home page is at r-project.org.
The guide describes installation of R from the official repository and testing functionality after installation.

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Guide for installation of R
Hint: Before you use this guide, we would recommend to have a knowledge of installing packages on the server and editing configuration via console to one of the editors.
1. Add GPG key repository
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys E298A3A825C0D65DFD57CBB651716619E084DAB9
2. Add R repository
sudo add-apt-repository 'deb https://cloud.r-project.org/bin/linux/ubuntu bionic-cran35/'
3. Update the repository and install updates for packages
sudo apt update
sudo apt upgrade
4. Install R package
sudo apt install r-base
Functionality test
sudo -i R
R version 3.6.1 (2019-07-05) -- "Action of the Toes" Copyright (C) 2019 The R Foundation for Statistical Computing
Traditional welcome message
> print("Hello world!")
Simple math
> 1 + 2 + 3
Quitting interactive shell
> q()