this is an extension from a previous post I made Here which I could not get to work but I am now getting a new error after updating Selenium.
I am using Python 3.5,
I got the same problem with my Ubuntu 20.10 and fixed it with the terminal using this line:
sudo apt-get install firefox-geckodriver
You can do the same with a macOS:
brew install geckodriver
Here ya go mate, anybody who is deep in this problem can solve theirs with this.