title: How to change python3 to default in linux mint
body: <p>I have a little problem with changing python3 to default in newly installed operating system linux Mint 19.3. It was pretty easy on Ubuntu 16.04 but now I need small help here. </p>
  
  <p>So, I run </p>
  
  <pre><code>python --version
  </code></pre>
  
  <p>and got this </p>
  
  <pre><code>Python 2.7.15+
  </code></pre>
  
  <p>Than I run </p>
  
  <pre><code>python3 --version
  </code></pre>
  
  <p>and this was the result</p>
  
  <pre><code>Python 3.6.8
  </code></pre>
  
  <p>After entering this command</p>
  
  <pre><code>sudo update-alternatives --config python
  </code></pre>
  
  <p>I received obvious info</p>
  
  <pre><code>update-alternatives: error: no alternatives for python
  </code></pre>
  
  <p>Both version of python are located in /usr/bin folder. 
  The issue occurs when I'm trying to change python3 to as a default by typing the command</p>
  
  <pre><code>sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.6
  </code></pre>
  
  <p>The terminal outputs the following</p>
  
  <pre><code>update-alternatives: --install needs &lt;link&gt; &lt;name&gt; &lt;path&gt; &lt;priority&gt;
  </code></pre>
  
  <p>Any help here would be welcome.</p>