What to Do When 'geckodriver' Executable Needs to Be in PATH in Ubuntu's Selenium

Trying to run Selenium on Ubuntu from Python

Traceback (most recent call last):
  ... omitted ...
  File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/firefox/webdriver.py", line 140, in __init__
    self.service.start()
  File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/common/service.py", line 81, in start
    os.path.basename(self.path), self.start_error_message)
selenium.common.exceptions.WebDriverException: Message: 'geckodriver' executable needs to be in PATH. 

Exception AttributeError: "'Service' object has no attribute 'process'" in <bound method Service.__del__ of <selenium.webdriver.firefox.service.Service object at 0x7fd28405b350>> ignored

If that happens,

wget https://github.com/mozilla/geckodriver/releases/download/v0.14.0/geckodriver-v0.14.0-linux64.tar.gz
tar -zxvf geckodriver-v0.14.0-linux64.tar.gz
sudo mv geckodriver /usr/local/bin/

You can check the latest release here: https://github.com/mozilla/geckodriver/releases

By the way, the constructor of webdriver.Firefox is as follows:

    def __init__(self, firefox_profile=None, firefox_binary=None,
                 timeout=30, capabilities=None, proxy=None,
                 executable_path="geckodriver", firefox_options=None,
                 log_path="geckodriver.log"):
        """Starts a new local session of Firefox.

So, it seems you can also specify the full path of geckodriver in the executable_path parameter.