title: error: symbol 'grub_calloc' not found on Ubuntu boot
body: <p>I am developing a Java application to run on Windows and Linux, instead of virtual machines, I need to use dual boot, however, after updating Ubuntu 20.04 LTS weekly, I'm trying to restart the machine and the terminal appears with an error message:</p>
  <pre><code>error: 'grub_calloc' symbol not found.
  Entering recovery mode ...
  grub rescue&gt;
  </code></pre>
  <p>How to fix this?</p>