我使用的是 Ubuntu 14.04，一切运行正常。但决定升级到 16.04。（真是个错误！）
现在我的耳机无法再连接到机器了。这有点奇怪。它有时能用，有时根本就不能用。
当我打开耳机时，它会尝试连接几次然后放弃。以下是日志：
Bluetooth monitor ver 5.37
= New Index: 00:09:DD:50:23:47 (BR/EDR,USB,hci0) [hci0] 0.768776
= Open Index: 00:09:DD:50:23:47 [hci0] 0.768778
= Index Info: 00:09:DD:50:23:47 (Cambridge Silicon Radio) [hci0] 0.768778
> HCI Event: Connect Request (0x04) plen 10 [hci0] 9.812387
Address: 00:0D:FD:35:78:D1 (Huges Hi-Tech Inc.,)
Class: 0x240404
Major class: Audio/Video (headset, speaker, stereo, video, vcr)
Minor class: Wearable Headset Device
Rendering (Printing, Speaker)
Audio (Speaker, Microphone, Headset)
Link type: ACL (0x01)
< HCI Command: Accept Connection Request (0x01|0x0009) plen 7 [hci0] 9.812416
Address: 00:0D:FD:35:78:D1 (Huges Hi-Tech Inc.,)
Role: Master (0x00)
> HCI Event: Command Status (0x0f) plen 4 [hci0] 9.816389
Accept Connection Request (0x01|0x0009) ncmd 1
Status: Success (0x00)
> HCI Event: Role Change (0x12) plen 8 [hci0] 9.975428
Status: Success (0x00)
Address: 00:0D:FD:35:78:D1 (Huges Hi-Tech Inc.,)
Role: Master (0x00)
> HCI Event: Connect Complete (0x03) plen 11 [hci0] 10.003463
Status: Success (0x00)
Handle: 42
Address: 00:0D:FD:35:78:D1 (Huges Hi-Tech Inc.,)
Link type: ACL (0x01)
Encryption: Disabled (0x00)
< HCI Command: Read Remote Supported Features (0x01|0x001b) plen 2 [hci0] 10.003643
Handle: 42
> HCI Event: Page Scan Repetition Mode Change (0x20) plen 7 [hci0] 10.005383
Address: 00:0D:FD:35:78:D1 (Huges Hi-Tech Inc.,)
Page scan repetition mode: R1 (0x01)
> HCI Event: Command Status (0x0f) plen 4 [hci0] 10.006375
Read Remote Supported Features (0x01|0x001b) ncmd 0
Status: Success (0x00)
> HCI Event: Max Slots Change (0x1b) plen 3 [hci0] 10.025427
Handle: 42
Max slots: 5
> HCI Event: Command Status (0x0f) plen 4 [hci0] 10.030425
NOP (0x00|0x0000) ncmd 1
Status: Success (0x00)
> HCI Event: Read Remote Supported Features (0x0b) plen 11 [hci0] 10.045425
Status: Success (0x00)
Handle: 42
Features: 0xff 0xfe 0x0f 0x86 0x8b 0xa9 0x00 0x00
3 slot packets
5 slot packets
Encryption
Slot offset
Timing accuracy
Role switch
Hold mode
Sniff mode
Power control requests
Channel quality driven data rate (CQDDR)
SCO link
HV2 packets
HV3 packets
u-law log synchronous data
A-law log synchronous data
CVSD synchronous data
Paging parameter negotiation
Power control
Transparent synchronous data
Enhanced Data Rate ACL 2 Mbps mode
Enhanced Data Rate ACL 3 Mbps mode
Extended SCO link (EV3 packets)
EV4 packets
EV5 packets
AFH capable slave
3-slot Enhanced Data Rate ACL packets
5-slot Enhanced Data Rate ACL packets
AFH capable master
Enhanced Data Rate eSCO 2 Mbps mode
3-slot Enhanced Data Rate eSCO packets
< HCI Command: Remote Name Request (0x01|0x0019) plen 10 [hci0] 10.045568
Address: 00:0D:FD:35:78:D1 (Huges Hi-Tech Inc.,)
Page scan repetition mode: R2 (0x02)
Page scan mode: Mandatory (0x00)
Clock offset: 0x0000
< ACL Data TX: Handle 42 flags 0x02 dlen 10 [hci0] 10.045584
L2CAP: Information Request (0x0a) ident 1 len 2
Type: Extended features supported (0x0002)
> HCI Event: Command Status (0x0f) plen 4 [hci0] 10.049382
Remote Name Request (0x01|0x0019) ncmd 1
Status: Success (0x00)
> HCI Event: Number of Completed Packets (0x13) plen 5 [hci0] 10.052379
Num handles: 1
Handle: 42
Count: 1
> ACL Data RX: Handle 42 flags 0x02 dlen 16 [hci0] 10.062426
L2CAP: Information Response (0x0b) ident 1 len 8
Type: Extended features supported (0x0002)
Result: Success (0x0000)
Features: 0x00000000
> HCI Event: Remote Name Req Complete (0x07) plen 255 [hci0] 10.090378
Status: Success (0x00)
Address: 00:0D:FD:35:78:D1 (Huges Hi-Tech Inc.,)
Name: Motorola S305
@ Device Connected: 00:0D:FD:35:78:D1 (0) flags 0x0000
0e 09 4d 6f 74 6f 72 6f 6c 61 20 53 33 30 35 04 ..Motorola S305.
0d 04 04 24 ...$
> HCI Event: Link Key Request (0x17) plen 6 [hci0] 10.117428
Address: 00:0D:FD:35:78:D1 (Huges Hi-Tech Inc.,)
< HCI Command: Link Key Request Reply (0x01|0x000b) plen 22 [hci0] 10.117558
Address: 00:0D:FD:35:78:D1 (Huges Hi-Tech Inc.,)
Link key: 8c794e46252db0e365fc8a05d5cc0fc2
> HCI Event: Command Complete (0x0e) plen 10 [hci0] 10.127423
Link Key Request Reply (0x01|0x000b) ncmd 1
Status: Success (0x00)
Address: 00:0D:FD:35:78:D1 (Huges Hi-Tech Inc.,)
> ACL Data RX: Handle 42 flags 0x02 dlen 12 [hci0] 10.242377
L2CAP: Connection Request (0x02) ident 2 len 4
PSM: 1 (0x0001)
Source CID: 64
> HCI Event: Encryption Change (0x08) plen 4 [hci0] 10.242396
Status: Success (0x00)
Handle: 42
Encryption: Enabled with E0 (0x01)
< ACL Data TX: Handle 42 flags 0x02 dlen 16 [hci0] 10.242499
L2CAP: Connection Response (0x03) ident 2 len 8
Destination CID: 64
Source CID: 64
Result: Connection successful (0x0000)
Status: No further information available (0x0000)
< ACL Data TX: Handle 42 flags 0x02 dlen 12 [hci0] 10.242511
L2CAP: Configure Request (0x04) ident 2 len 4
Destination CID: 64
Flags: 0x0000
> HCI Event: Number of Completed Packets (0x13) plen 5 [hci0] 10.248419
Num handles: 1
Handle: 42
Count: 1
> HCI Event: Number of Completed Packets (0x13) plen 5 [hci0] 10.249372
Num handles: 1
Handle: 42
Count: 1
> ACL Data RX: Handle 42 flags 0x02 dlen 16 [hci0] 10.257424
L2CAP: Configure Request (0x04) ident 3 len 8
Destination CID: 64
Flags: 0x0000
Option: Maximum Transmission Unit (0x01) [mandatory]
MTU: 48
< ACL Data TX: Handle 42 flags 0x02 dlen 18 [hci0] 10.257557
L2CAP: Configure Response (0x05) ident 3 len 10
Source CID: 64
Flags: 0x0000
Result: Success (0x0000)
Option: Maximum Transmission Unit (0x01) [mandatory]
MTU: 48
> ACL Data RX: Handle 42 flags 0x02 dlen 14 [hci0] 10.260373
L2CAP: Configure Response (0x05) ident 2 len 6
Source CID: 64
Flags: 0x0000
Result: Success (0x0000)
> HCI Event: Number of Completed Packets (0x13) plen 5 [hci0] 10.263420
Num handles: 1
Handle: 42
Count: 1
> ACL Data RX: Handle 42 flags 0x02 dlen 24 [hci0] 10.273419
Channel: 64 len 20 [PSM 1 mode 0] {chan 0}
SDP: Service Search Attribute Request (0x06) tid 1 len 15
Search pattern: [len 7]
Sequence (6) with 5 bytes [8 extra bits] len 7
UUID (3) with 4 bytes [0 extra bits] len 5
Handsfree Audio Gateway (0x0000111f)
Max record count: 38
Attribute list: [len 5]
Sequence (6) with 3 bytes [8 extra bits] len 5
Unsigned Integer (1) with 2 bytes [0 extra bits] len 3
0x0004
Continuation state: 0
< ACL Data TX: Handle 42 flags 0x02 dlen 14 [hci0] 10.273695
Channel: 64 len 10 [PSM 1 mode 0] {chan 0}
SDP: Service Search Attribute Response (0x07) tid 1 len 5
Attribute bytes: 2
Continuation state: 0
> HCI Event: Number of Completed Packets (0x13) plen 5 [hci0] 10.279418
Num handles: 1
Handle: 42
Count: 1
> ACL Data RX: Handle 42 flags 0x02 dlen 12 [hci0] 10.287414
L2CAP: Disconnection Request (0x06) ident 4 len 4
Destination CID: 64
Source CID: 64
< ACL Data TX: Handle 42 flags 0x02 dlen 12 [hci0] 10.287547
L2CAP: Disconnection Response (0x07) ident 4 len 4
Destination CID: 64
Source CID: 64
> HCI Event: Number of Completed Packets (0x13) plen 5 [hci0] 10.293420
Num handles: 1
Handle: 42
Count: 1
> HCI Event: Disconnect Complete (0x05) plen 4 [hci0] 10.704410
Status: Success (0x00)
Handle: 42
Reason: Remote User Terminated Connection (0x13)
@ Device Disconnected: 00:0D:FD:35:78:D1 (0) reason 3
这会重复几次才会放弃但如果我使用 bluetoothctl 手动连接到耳机，那么 ubuntu 就会直接连接到它。（不幸的是，日志不适合可用的问题空间）在此初始连接之后，如果我通过关闭和打开耳机来断开/重新连接，它似乎可以工作......
有什么想法吗？谢谢！
更新： 现在它运行正常，无需安装 blueman 或 gnome-bluetooth。BlueZ 和 PulseAudio 已安装。我将我的 conf 文件中的内容放在这里，希望将来能对某些人有所帮助。（我只放了我更改的设置）
蓝牙/main.conf
DiscoverableTimeout = 0
AutoEnable=true
pulseaudio/default.pa
# automatically switch to newly-connected devices
load-module module-switch-on-connec
我不太明白为什么一开始它不起作用。这很奇怪，因为我认为我以前也有同样的设置。一旦蓝牙设备连接，我就使用脚本切换到 a2dp（我不确定这是否在 16.05 中得到修复，但它在 14.04 中是一个问题）