title: How to specify a CRAN mirror to install R packages in Jupyter Notebook (R kernel)
body: <p>I'm having a problem installing a package for Jupyter Notebook R kernel...</p>
  
  <p>The message is clear:</p>
  
  <p><a href="https://i.stack.imgur.com/UOg8x.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/UOg8x.png" alt="enter image description here"></a></p>
  
  <p>Question:</p>
  
  <p>How do I set up or specify a mirror?</p>