title: InstaPy: "Error, unable to determine correct filename for 64bit linux"
body: <p>Anyone knows how to solve of fix this issue?
  Stack trace from console, that reports an error after execution:</p>
  <pre class="lang-sh prettyprint-override"><code>    InstaPy Version: 0.6.9
      ._.  ._.  ._.  ._.  ._.  ._.  ._.  ._.  ._. 
      Workspace in use: &quot;/home/zanettra/InstaPy&quot;
      Error, unable to determine correct filename for 64bit linux
      Traceback (most recent call last):
      File &quot;unfollow.py&quot;, line 24, in &lt;module&gt;
      headless_browser=False)
      File &quot;/usr/local/lib/python3.6/dist-packages/instapy/instapy.py&quot;, line 
      322, in __init__
      self.logger,
        File &quot;/usr/local/lib/python3.6/dist-packages/instapy/browser.py&quot;, line 114, in set_selenium_local_session
          driver_path = geckodriver_path or get_geckodriver()
        File &quot;/usr/local/lib/python3.6/dist-packages/instapy/browser.py&quot;, line 36, in get_geckodriver
          sym_path = gdd.download_and_install()[1]
        File &quot;/usr/local/lib/python3.6/dist-packages/webdriverdownloader/webdriverdownloader.py&quot;, line 177, in download_and_install
          show_progress_bar=show_progress_bar)
        File &quot;/usr/local/lib/python3.6/dist-packages/webdriverdownloader/webdriverdownloader.py&quot;, line 129, in download
          download_url = self.get_download_url(version, os_name=os_name, bitness=bitness)
        File &quot;/usr/local/lib/python3.6/dist-packages/webdriverdownloader/webdriverdownloader.py&quot;, line 324, in get_download_url
          raise RuntimeError(info_message)
      RuntimeError: Error, unable to determine correct filename for 64bit linux
  </code></pre>