So I upgraded by OS from Ubuntu Precise (12.04) to Vivid (15.04) but I am unable to install R on this, after running it successfully on the older version.
I have tried various CRAN repositories in the sources.list file but none of them appear to be working. I have, however, installed other things using my command line so it definitely isn’t a network issue at my end.
I have attached a screenshot of the terminal. Please let me know where I’m going wrong.
This is what I have added in the sources.list file -