Package: flatpak Version: 0.11.3-2 Severity: important Adrian Bunk pointed out on IRC that at least some uses of Flatpak need policykit-1, but it doesn't have any dependency relationship with policykit-1.
I haven't checked yet, but I think "flatpak --user" (installing apps for just yourself) should work OK without polkit. The part that won't work is running flatpak without --user to install apps system-wide. If that guess is right, then this is a bug but not release-critical - I think having flatpak Recommends: policykit-1 would be proportionate. smcv