Thanks for all the help here. I got here trying to fix screen sharing issues. I installed `xdg-desktop-portal-gtk` which recommends `dbus-user-session` OR `dbus-x11`. And I already had `dbus-x11` installed from `gnome-session`.
Perhapds `xdg-desktop-portal-gtk` should ensure that `dbus-user-session` is installed.
