title: Crontab never run on Ubuntu
body: <p>I have the following crontab setup. </p>
  
  <pre><code>30 * * * 1-5   /home/ubuntu/script_abc.sh 
  </code></pre>
  
  <p>script_abc.sh has permission <code>-rwxr-xr-x</code> and the following content. </p>
  
  <pre><code>#!/bin/sh
  
  source ~/my_app/venv/bin/activate
  
  export APP_KEY=abkajdfljdasfljdalfk
  cd ~/my_app
  python ~/my_app/scripts/scan.py 
  </code></pre>
  
  <p>It seems crontab never run my script. Any idea? </p>