<p>I tried by doing <code>sudo apt-get update</code> and now got more errors, they are related to unitialized constants.<br>
<a target="_blank" rel="noopener noreferrer" href="https://user-images.githubusercontent.com/51020710/60730933-a1904c80-9f1c-11e9-8419-85e2708c36c2.png"><img src="https://user-images.githubusercontent.com/51020710/60730933-a1904c80-9f1c-11e9-8419-85e2708c36c2.png" alt="constants" style="max-width:100%;"></a></p>

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