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For questions pertaining to Bluetooth setup, usage and troubleshooting on the Raspberry Pi, whether onboard or via a USB dongle.
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Bluetooth connection attempt gives "Failed to connect: org.bluez.Error.Failed"
connecting to an audio device, this could be happening for various reasons:
Pulseaudio is not running (use pulseaudio --start)
The appropriate module is not installed (use apt install pulseaudio-module-bluetooth … )
See https://unix.stackexchange.com/questions/258074/error-when-trying-to-connect-to-bluetooth-speaker-org-bluez-error-failed for more info …