Ubuntu 18.04 LTS apt get install R4.0.3

 

see: 

https://askubuntu.com/questions/1237102/problem-installing-r-4-0-on-ubuntu-18-04

 sudo apt remove r-base

 sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys E298A3A825C0D65DFD57CBB651716619E084DAB9

sudo add-apt-repository 'deb https://cloud.r-project.org/bin/linux/ubuntu bionic-cran40/'

sudo apt update

sudo apt install r-base