This question already has an answer here:
In order to get around an issue with Starbucks WIFI someone suggested spoofing my network cards mac address. How do I detect whether the wifi card supports mac address spoofing?
There is material out there on this, but it is very dated. How do you do this on Ubuntu 17.10?
I ended up just running this:
sudo macchanger --mac 00:11:22:33:44:55 wlan0
iwconfig to detect the name of your wireless card. Unfortunately this did not resolve the issue with Starbucks WIFI.