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Installing R on Ubuntu 19.10


Download R Source code from
https://cran.rstudio.com/index.html

extract the .tar.gz file to a location
gzip -dc R-x.y.z.tar.gz | tar -xf -

current sources for the recommended packages, which can be obtained by rsync or downloaded from CRAN. To use rsync to install the appropriate sources for the recommended packages, run ./tools/rsync-recommended from the top-level directory of the R sources.

Install necessary packages to add repository over HTTPS
sudo apt install apt-transport-https software-properties-common


Add CRAN external repository
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys E298A3A825C0D65DFD57CBB651716619E084DAB9
sudo add-apt-repository 'deb https://cloud.r-project.org/bin/linux/ubuntu bionic-cran35/'

 edit /etc/apt/sources.list and remove comments for deb-src for line containing cran35/
(mostly last line of this file)

execute sudo apt-get update to read the sources files.

Install package dependencies using
sudo apt-get build-dep r-base

This step will download a tone of dependencies and may take some time

Now navigate to folder where R is extracted and execute
./configure --prefix=/opt/R/3.6.2 --enable-R-shlib --with-blas --with-lapack

This prepares a make file that installs R under /opt
blas enables to use system libraries rather than R internal libraries. It improves analytics calculation speed.

Output should look like something like this


Execute make comment to execute it
make

finally install it by 
sudo make install

you can optionally create a short cut for it using
sudo ln -s /opt/R/3.6.2/bin/R /bin/R



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