title: R 3.5, Ubuntu 18.04, Error: Unable to establish connection with R session
body: <p>I've got a fresh install of the three things on my Linux testbed laptop; <code>Ubuntu 18.04</code>, <code>R 3.5</code>, <code>R Studio 1.1.453</code>.</p>
  
  <p>I can open a fresh instance of R Studio with nothing loaded. Let it sit idle for an hour. Then when I run any command I get <code>Error: Unable to establish connection with R session</code>.</p>
  
  <p>I am able to use R Studio normally for ~30 or so minutes before this <em>lost connection</em> issue starts happening.</p>
  
  <p>Any ideas what is happening and what to do about it?</p>