Public bug reported:
When I run gnome-control-center (1:3.36.1-1ubuntu5) on a remote Ubuntu
20.04 host over ssh -X, trying to enable Screen Sharing (VNC) or Media
Sharing in the Sharing panel (*) fails with the following D-Bus related
messages on the standard error:
----------------------------------------------------------
(gnome-control-center:25937): sharing-cc-panel-WARNING **: 00:15:12.770:
couldn't list networks: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown:
The name org.gnome.SettingsDaemon.Sharing was not provided by any .service files
(gnome-control-center:25937): sharing-cc-panel-WARNING **: 00:15:28.646:
Failed to enable service vino-server:
GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name
org.gnome.SettingsDaemon.Sharing was not provided by any .service files
(gnome-control-center:25937): sharing-cc-panel-WARNING **: 00:15:54.309: Failed
to enable service rygel: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown:
The name org.gnome.SettingsDaemon.Sharing was not provided by any .service files
----------------------------------------------------------
What does this mean? Can I do anything about it? A remote user, sitting
in front of the remote computer, can enable Screen Sharing or Media
Sharing in gnome-control-center themselves. Failure to enable only
occurs over ssh -X, as far as I can tell.
Looking up this error online led me down a D-Bus rabbit hole. I found
many year-old StackExchange answers that recommend setting various
environment variables and/or running dbus-launch to start a session bus
instance of dbus-daemon, in case of D-Bus related errors.
I am rather unfamiliar with D-Bus, but I can see using ps -ef | grep
dbus that a session bus instance of dbus-daemon is already running. It
has been started under my UID at the time of my SSH login. So I'm wary
of those old resources. I have tried following their instructions
though, for completeness sake, but to no avail. I can provide more
information if necessary.
(*) This odd situation happened when I had to provide technical support
over VNC to an older user whose computer I had previously set up with
SSH access. Hence why I was using ssh -X to try and enable VNC in gnome-
control-center...
** Affects: gnome-control-center (Ubuntu)
Importance: Undecided
Status: New
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Desktop Bugs, which is subscribed to gnome-control-center in Ubuntu.
https://bugs.launchpad.net/bugs/1878109
Title:
Certain features in the Sharing panel fail with D-Bus related messages
when gnome-control-center is run over ssh -X
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