title: PATH issue: Could not find valid SPARK_HOME while searching
body: <p>I updated my PATH to look like this:</p>
  
  <pre><code>PATH="$HOME/bin:$HOME/.local/bin:$PATH:/home/username/Installs/Spark/bin"
  </code></pre>
  
  <p>I <em>think</em> it worked as I managed to call spark-shell from a different folder (although I'm wondering if I'm going crazy and it was really from the bin folder). However after rebooting Ubuntu it no longer seems to work. Why?</p>
  
  <pre><code>Could not find valid SPARK_HOME while searching ['/home/username', '/usr/local/bin']
  /usr/local/bin/spark-shell: line 57: /bin/spark-submit: No such file or directory
  </code></pre>