title: sbt/sbt : no such file or directory error
body: <p>I'm trying to install spark in my ubuntu machine. I have installed sbt and scala. I'm able to view their versions. But, when I try to install spark using 'sbt/sbt assembly' command, i get the below error.
  'bash: sbt/sbt: No such file or directory'</p>
  
  <p>Can you please let me know where I am making a mistake. I have been stuck here since yesterday. </p>
  
  <p>Thank you for the help in advance.</p>