Bluez daemon is not running

[Chrisdb]

The system detects your device

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Bus 002 Device 005: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode)

But apparently, the bluetooth service is killed for some reason:

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Jan 21 08:17:15 debian systemd[1]: Started Bluetooth service.
Jan 21 08:17:15 debian bluetoothd[3816]: Starting SDP server
Jan 21 08:17:15 debian bluetoothd[3816]: Bluetooth management interface 1.14 ini
Jan 21 08:17:15 debian bluetoothd[3816]: Failed to obtain handles for "Service C
Jan 21 08:17:15 debian bluetoothd[3816]: Sap driver initialization failed.
Jan 21 08:17:15 debian bluetoothd[3816]: sap-server: Operation not permitted (1)
Jan 21 08:17:16 debian bluetoothd[3816]: Endpoint registered: sender=:1.36 path=
Jan 21 08:17:16 debian bluetoothd[3816]: Endpoint registered: sender=:1.36 path=
Jan 21 08:24:00 debian bluetoothd[3816]: Endpoint unregistered: sender=:1.36 pat
Jan 21 08:24:00 debian bluetoothd[3816]: Endpoint unregistered: sender=:1.36 pat
Jan 22 20:42:21 debian bluetoothd[3816]: Failed to obtain handles for "Service C
Jan 22 20:42:22 debian bluetoothd[3816]: Sap driver initialization failed.
Jan 22 20:42:22 debian bluetoothd[3816]: sap-server: Operation not permitted (1)
Jan 22 20:42:22 debian bluetoothd[3816]: Endpoint registered: sender=:1.36 path=
Jan 22 20:42:22 debian bluetoothd[3816]: Endpoint registered: sender=:1.36 path=
Jan 22 20:43:56 debian systemd[1]: Stopping Bluetooth service...
Jan 22 20:43:56 debian bluetoothd[3816]: Terminating

Can you post output of the following after plugin of your device and restart of bluetooth service:

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sudo systemctl -xb

Also, can you post output of:

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btmgmt info

And:

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busctl tree org.bluez