Comment 9 for bug 1564570

Ok, I have a partial solution for this in zesty-proposed. (It's in -proposed because it needs an Archive Admin to let the arch:all package depend on an arch:i386 similar to how pixfrogger was handled LP: #1585058)

The problem is the installation fails because of a debconf prompt. I get the popup message displayed below. To duplicate, be sure to first run
sudo apt purge steam

And to fix apt afterwards, run
sudo apt install -f

Sorry, this did not work
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Detailed errors from the package manager follow:

Error while installing package: subprocess new pre-installation script returned error exit status 1