raspi/pybluez/bluetooth.btcommon.BluetoothError: [Errno 2] No such file or directory.md
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+参考: https://stackoverflow.com/a/69077661/11842985
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+
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+Raspberry Pi 4の場合
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+```bash
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+$ sudo mkdir /etc/systemd/system/bluetooth.service.d/
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+$ sudo vim /etc/systemd/system/bluetooth.service.d/override.conf
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+```
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+
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+```
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+[Service]
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+ExecStart=
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+ExecStart=/usr/libexec/bluetooth/bluetoothd -C
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+```
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+
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+```
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+$ sudo systemctl daemon-reload
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+$ sudo systemctl restart bluetooth
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+```
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