Where are the proprietary NVIDIA drivers in 16.04?

The proprietary NVIDIA drivers "disappeared" with my latest update:

The option of "Proprietary drivers for devices" is correctly set under the "Ubuntu Software" tab. I have the graphics-driver PPA (ppa:graphics-drivers/ppa) correctly added to my sources.

Any ideas on how to bring the proprietary drivers back?

PS1: I need them because some of the games I play under wine don't work without them, for whatever reason.

PS2: Also, this feels like it should have a straightforward answer, but I've been looking online for a while without luck.

All these drivers, except X.Org are proprietary Nvidia drivers.

The open source is a bug of the user interface.

In your case the proprietary driver is already installed.