How to diagnose Bluetooth trouble?

[Daniel Hatton]

I've previously mentioned on here that I couldn't get 
(USB-dongle-provided) Bluetooth to start on boot, always had to start it 
manually from the Gnome settings app.  Well, for the last week or so, I 
can't even start it manually - when I click the little switch at the top 
of the Gnome settings window, it refuses to switch on.  How do I go 
about diagnosing what's wrong, please?  Instructions I find on the WWW 
seem to assume systemd, and I'm on shepherd.

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Kind regards,

Dan Hatton

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