title: rsession: no process found - R Studio
body: <p>I am installing R Studio on AWS ec2 instance running Ubuntu. While installation I get an error "rsession: no process found". 
  After installation I opened "server_ip:8787" in browser, R Studio asked me for login credentials. I am unable to login as it always shows "RStudio initialization error : Unable to connect to server".</p>
  
  <p>In terminal when I enter <code>sudo rstudio-server verify-installation</code> nothing happens.</p>
  
  <p><code>sudo rstudio-server restart</code> gives <code>rsession: no process found</code>.</p>
  
  <p>I also tried <code>sudo ufw allow 8787</code> but no success. </p>