$ sudo apt-get update
$ sudo apt-get install r-cran-erm 

r-cran-erm is installed in your system.

Make ensure the r-cran-erm package were installed using the commands given below,

$ sudo dpkg-query -l | grep r-cran-erm *

You will get with r-cran-erm package name, version, architecture and description in a table

r-cran-erm package basic information: