我正在使用 Ubuntu 18.04（VERSION="18.04.4 LTS（Bionic Beaver）"），想通过蓝牙连接我的小米 MI5 手机，这样我就可以在手机之间传输文件；我开始觉得这可能是不可能的。
我已经发现了这一点：bluetoothd（BlueZ 5）无法连接任何设备- 不过，这似乎与我的问题不同。我对蓝牙的经验很少，所以我需要一些帮助，拜托。
使用 debugoutput 重新启动 bluetoothd 后，当我尝试从手机配对时，看到以下内容：
Mar 5 11:26:08 GR-00258 bluetoothd[13393]: src/adapter.c:connected_callback() hci0 device AC:C1:EE:1B:80:5A connected eir_len 16
Mar 5 11:26:09 GR-00258 bluetoothd[13393]: src/adapter.c:user_confirm_request_callback() hci0 AC:C1:EE:1B:80:5A confirm_hint 0
Mar 5 11:26:09 GR-00258 bluetoothd[13393]: src/device.c:new_auth() Requesting agent authentication for AC:C1:EE:1B:80:5A
Mar 5 11:26:09 GR-00258 bluetoothd[13393]: src/agent.c:agent_ref() 0x564d7482d880: ref=2
Mar 5 11:26:09 GR-00258 bluetoothd[13393]: src/agent.c:agent_request_confirmation() Calling Agent.RequestConfirmation: name=:1.70, path=/modules/bluedevil/Agent, passkey=087258
Mar 5 11:26:39 GR-00258 bluetoothd[13393]: src/adapter.c:bonding_attempt_complete() hci0 bdaddr AC:C1:EE:1B:80:5A type 0 status 0x5
Mar 5 11:26:39 GR-00258 bluetoothd[13393]: src/device.c:device_bonding_complete() bonding (nil) status 0x05
Mar 5 11:26:39 GR-00258 bluetoothd[13393]: src/agent.c:send_cancel_request() Sending Cancel request to :1.70, /modules/bluedevil/Agent
Mar 5 11:26:39 GR-00258 bluetoothd[13393]: src/device.c:device_cancel_authentication() Canceling authentication request for AC:C1:EE:1B:80:5A
Mar 5 11:26:39 GR-00258 bluetoothd[13393]: src/agent.c:agent_unref() 0x564d7482d880: ref=1
Mar 5 11:26:39 GR-00258 bluetoothd[13393]: src/device.c:device_bonding_failed() status 5
Mar 5 11:26:39 GR-00258 bluetoothd[13393]: src/adapter.c:resume_discovery()
Mar 5 11:26:39 GR-00258 bluetoothd[13393]: src/adapter.c:dev_disconnected() Device AC:C1:EE:1B:80:5A disconnected, reason 3
Mar 5 11:26:39 GR-00258 bluetoothd[13393]: src/adapter.c:adapter_remove_connection()
Mar 5 11:26:39 GR-00258 bluetoothd[13393]: plugins/policy.c:disconnect_cb() reason 3
Mar 5 11:26:39 GR-00258 bluetoothd[13393]: src/adapter.c:bonding_attempt_complete() hci0 bdaddr AC:C1:EE:1B:80:5A type 0 status 0xe
Mar 5 11:26:39 GR-00258 bluetoothd[13393]: src/device.c:device_bonding_complete() bonding (nil) status 0x0e
Mar 5 11:26:39 GR-00258 bluetoothd[13393]: src/device.c:device_bonding_failed() status 14
Mar 5 11:26:39 GR-00258 bluetoothd[13393]: src/adapter.c:resume_discovery()
如果我尝试从 PC 连接：
Mar 5 11:35:52 GR-00258 bluetoothd[13393]: src/device.c:connect_profiles() /org/bluez/hci0/dev_AC_C1_EE_1B_80_5A (all), client :1.88
Mar 5 11:35:52 GR-00258 bluetoothd[13393]: profiles/audio/a2dp.c:a2dp_source_connect() path /org/bluez/hci0/dev_AC_C1_EE_1B_80_5A
Mar 5 11:35:52 GR-00258 bluetoothd[13393]: a2dp-source profile connect failed for AC:C1:EE:1B:80:5A: Protocol not available