Comment 14 for bug 1564570

Yes, I assume it would happen on Debian if you are running i386!

Otherwise, steam is uninstallable in GNOME Software (that's what this bug is originally about, and I haven't forwarded my changes to Debian yet).

I can verify the debconf issue with GNOME Software using the PK backend on Ubuntu.

Debian's steam uses debconf like they do because you are supposed to agree to the steam install agreement before installing :(
https://sources.debian.net/data/non-free/s/steam/1.0.0.54-2/steam_install_agreement.txt