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When you are in the initial install state, you can easily switch from the Nouvea drivers to the Nvidia drivers by choosing the option in "Software and Updates -> Additional Drivers". However, when you attempt to switch back (by selecting the nouveau option and clicking Apply), and subsequently reboot, your system will still come up using the Nvidia drivers, and you will WTF.
And then, if you visit Additional Drivers, you will be presented with grayed out options for both nvidia and nouvea, and the only selectable option will be "continue using manually installed driver".
The reason for this is that the tool, when reselecting nvidia in the GUI, uninstalls the nvidia-drivers-390 package, but because it's a metapackage (or at least I presume this is the reason), it doesn't uninstall its dependencies, which causes the Additional Drivers tool to believe it's in a non-automanaged state, and the nvidia drivers never actually get uninstalled.
You can fix it by doing an apt autoremove and rerunning the Additional Drivers tool. But obviously there is no real way for inexperienced users to know this.