python + selenium clicker fix

Please read carefully, since I won't assign the project to anybody needing repeating. I need immediate start and quality. No intermediate milestones, only final milestone. I have a small and modular script done with python + selenium + firefox webdriver. The developer doesn't work anymore on freelancer. The script was fine on Ubuntu 14, but I moved to Ubuntu 16 desktop due to hard disk failure and it doesn't work anymore. The script performs really simple tasks and it's almost stupid if you really know the above technologies. But I'm only experienced with PHP, so I need your help. I need Ubuntu Gnome to see the script in action, but if you know different way or advice (e.g. xvfb + vnc), all is welcome if it works and has got clear instructions provided for the production phase. You can access via public IP to my VM, or you can build your own and upload it somewhere. The script should launch multiple simultaneous instances (actually 10 but it could increase) or wait for the instances to be and tracks this via remote mysql, but a different way is allowed if it's working. It has unused functions which can be deleted. If everything is fine, I put instructions and scripts in production (no videos, no teamviewer), you get paid and have the opportunity to maintain this script and additional similar projects.