Like everyone with an Ubuntu distro, I checked my two Mate installations for Rygel about two days ago. No signs of its presence.
Today, in inux XXXXX 5.3.0-19-generic #20-Ubuntu SMP Fri Oct 18 09:04:39 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux, an upgrade from 19.04 to 19.10, not present, nor included in packages in "Software Updater".
However, on laptop B, inux YYYYYY 5.3.0-19-generic #20-Ubuntu SMP Fri Oct 18 09:04:39 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux, clean install 19.10, while not installed two days ago, "to be installed" Rygel and what I presumed were Rygel deps.
Why was a new package for which I have no use installed, for apparently no reason? I have not changed repos from default install, nor have I any need for Rygel.
Obviously, my suspicion is that for the reasons making the rounds on the internet, a version was included to allow disabling Rygel is systemd for those not running gnome shell, but this is a guess.
Is there concrete information available?
Thank you for all your work and dedication.