No such file or directory: 'geckodriver' for a Python simple Selenium application : <p>I'm running a simple example of selenium on Linux:</p>

<pre><code>from selenium import webdriver
from selenium.webdriver.common.keys import Keys

driver = webdriver.Firefox()
driver.get("something")
</code></pre>

<p>and get an error:</p>

<pre><code>FileNotFoundError: [Errno 2] No such file or directory: 'geckodriver'
</code></pre>

<p>How to fix it?</p>

<pre><code>$ python
Python 3.5.2 (default, Jun 28 2016, 08:46:01) 
[GCC 6.1.1 20160602] on linux
Type "help", "copyright", "credits" or "license" for more information.
&gt;&gt;&gt; import selenium
&gt;&gt;&gt; from selenium.webdriver.common.keys import Keys
&gt;&gt;&gt; 
</code></pre>
