Cannot install or remove any software: "Critical problem with the apps registry" / "Url scheme is a required component."

[nephros]

@neo75

DBus call failed, falling back to libssu: Message recipient disconnected from message bus without replying

I also found this:

Updating to 3.3.0.16 fails via UI and terminal. [closed] - together.jolla.com

where the suggestion is to move away all the files in /etc/zypp/repos.d/ and try again.