How can I install a R package on a offline Debian machine?

Question

I have an Debian VM which is not connected to internet. Yet, I can still scp any file from my local machine which does have internet connection. To provide a little bit context,

Answer 1

sudo apt-get update

sudo apt-get install r-cran-digest

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I can`t belive that it was so easy. I spent a long time searching and got only bad answers. This commands just solve everything. I used it on trisquel