How to Install R and RStudio on Ubuntu 16.04 (xenial) for the blog https://medium.com/@GalarnykMichael/install-r-and-rstudio-on-ubuntu-12-04-14-04-16-04-b6b3107f7779#.8bwdcvjxv

RStudioUbuntu1604.sh

# Install R + RStudio on Ubuntu 16.04

sudo apt-key adv –keyserver keyserver.ubuntu.com –recv-keys E084DAB9

# Ubuntu 12.04: precise
# Ubuntu 14.04: trusty
# Ubuntu 16.04: xenial
# Basic format of next line deb https://<my.favorite.cran.mirror>/bin/linux/ubuntu <enter your ubuntu version>/
sudo add-apt-repository 'deb https://ftp.ussg.iu.edu/CRAN/bin/linux/ubuntu xenial/'
sudo apt-get update
sudo apt-get install r-base
sudo apt-get install r-base-dev

# Download and Install RStudio
sudo apt-get install gdebi-core
wget https://download1.rstudio.org/rstudio-1.0.44-amd64.deb
sudo gdebi rstudio-1.0.44-amd64.deb
rm rstudio-1.0.44-amd64.deb

I had a problem with sudo gdebi rstudio-1.0.44-amd64.deb so I used commands bellow instead:

sudo dpkg -i rstudio-1.0.44-amd64.deb
sudo apt-get install -f

Hey, I had the same problems upgrading to the newest R-version.
First, remove all your r installation if it doesn't work by
sudo apt purge r-base* r-recommended r-cran-*

The only way to get R 3.5/3.6 installed correctly was the following way:

sudo add-apt-repository ppa:marutter/rrutter3.5
sudo apt-get update
sudo apt-get -y install r-api-3.5

sudo su
echo "deb https://cloud.r-project.org/bin/linux/ubuntu xenial-cran35/" >> /etc/apt/sources.list
apt-key adv --keyserver keyserver.ubuntu.com --recv-keys E084DAB9
apt-get update
apt-get install r-base
apt-get install r-base-dev

i am having issues

when try to open after the installation, showing a blank rstudio application

Great! Thank a lot! :-). Works nicely

Thanks !!!