I had Ubuntu Studio 18.04LTS. My panel went missing. I started it via terminal. After that, every boot, I got a stack of repeat instances of error messages.
"GDBus.errorrg.freedesktop.DBus.Error.ServiceUnknown: The name org.xfce.Panel was not provided by any .service files"
"Modifying the panel is not allowed: Because the panel is running in kiosk mode, you are not allowed to make changes to the panel configuration as a regular user."
Of course, there was no panel visible to make changes to until after I'd started a new one every time!
When I started the new instance the first time, the old panel was replaced by a new default panel. I added launchers, the new one stuck around. I still had to go through the above scenario every reboot.
This weekend, I upgraded, via the software updater, to Ubuntu Studio 20.04LTS. New panel problem! Now when I start, I still get "GDBusErrorrg.freedesktop.Error.ServiceUnknown: The name org.Xfce.panel was not provided by any .service files." I don't get the other message any more.
The panel is there at start, but it's got a blinking red border, as if it's being edited. I open the Panel settings in Settings Manager, close it, and no more blinking.
I tried to have a look at the Xfce4panel.xml file, but there isn't one. I am utterly confused about what's happening here! Any help appreciated.
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