I have a 2017 MacBook Pro (15") and have put Ubuntu 18.04 on it. I've managed to get the drivers for keyboard and the trackpad working, but so far, I am unable to connect to Wi-Fi.
But I am able to see Wi-Fi networks, and I can attempt to connect to the (type in password etc. - yes, the password is correct), but the network utility just spins for a minute, and then asks for the password again.
I am happy to provide whatever details you need!