Unable to set default python version to python3 in ubuntu : <p>I was trying to set default python version to <code>python3</code> in <code>Ubuntu 16.04</code>. By default it is <code>python2</code> (2.7). I followed below steps :  </p>

<pre><code>update-alternatives --remove python /usr/bin/python2
update-alternatives --install /usr/bin/python python /usr/bin/python3
</code></pre>

<p>but I'm getting the following error for the second statement,    </p>

<pre><code>rejeesh@rejeesh-Vostro-1015:~$ update-alternatives --install /usr/bin/python python /usr/bin/python3
update-alternatives: --install needs &lt;link&gt; &lt;name&gt; &lt;path&gt; &lt;priority&gt;

Use 'update-alternatives --help' for program usage information.   
</code></pre>

<p>I'm new to Ubuntu and Idon't know what I'm doing wrong.</p>
