我的蓝牙在 ubuntu 14.04 上无法使用。我不确定是不是我的蓝牙适配器没有被识别，还是缺少必要的驱动程序。我尝试了很多方法，但都没有成功。我发现类似的问题在问题上得到了解决。[我的蓝牙在 Ubuntu 14.10 中被禁用
以下是必要命令的输出。
dexter@dexter-Lenovo-G50-80:~$ lspci -nnk | grep -iA2 net
02:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 10)
Subsystem: Lenovo Device [17aa:3821]
Kernel driver in use: r8169
03:00.0 Network controller [0280]: Broadcom Corporation BCM43142 802.11b/g/n [14e4:4365] (rev 01)
Subsystem: Lenovo Device [17aa:0621]
Kernel driver in use: wl
dexter@dexter-Lenovo-G50-80:~$
dexter@dexter-Lenovo-G50-80:~$ lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 005: ID 105b:e065
Bus 001 Device 004: ID 0bda:579a Realtek Semiconductor Corp.
Bus 001 Device 003: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader Controller
Bus 001 Device 002: ID 3938:1031
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
dexter@dexter-Lenovo-G50-80:~$
dexter@dexter-Lenovo-G50-80:~$ rfkill list all
0: ideapad_wlan: Wireless LAN
Soft blocked: no
Hard blocked: no
1: ideapad_bluetooth: Bluetooth
Soft blocked: no
Hard blocked: no
2: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
3: brcmwl-0: Wireless LAN
Soft blocked: no
Hard blocked: no
dexter@dexter-Lenovo-G50-80:~$
dexter@dexter-Lenovo-G50-80:~$ dmesg | grep -i bluetooth
[ 18.546763] Bluetooth: Core ver 2.20
[ 18.546779] Bluetooth: HCI device and connection manager initialized
[ 18.546784] Bluetooth: HCI socket layer initialized
[ 18.546787] Bluetooth: L2CAP socket layer initialized
[ 18.546795] Bluetooth: SCO socket layer initialized
[ 18.549488] Bluetooth: RFCOMM TTY layer initialized
[ 18.549496] Bluetooth: RFCOMM socket layer initialized
[ 18.549500] Bluetooth: RFCOMM ver 1.11
[ 18.701848] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 18.701851] Bluetooth: BNEP filters: protocol multicast
[ 18.701854] Bluetooth: BNEP socket layer initialized
dexter@dexter-Lenovo-G50-80:~$
dexter@dexter-Lenovo-G50-80:~$ uname -a
Linux dexter-Lenovo-G50-80 3.19.0-25-generic #26~14.04.1-Ubuntu SMP Fri Jul 24 21:16:20 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
dexter@dexter-Lenovo-G50-80:~$ hciconfig -a
dexter@dexter-Lenovo-G50-80:~$
dexter@dexter-Lenovo-G50-80:~$ modinfo btusb | grep alias | grep -i 04ca
alias: usb:v04CAp*d*dc*dsc*dp*icFFisc01ip01in*
alias: usb:v04CAp2003d*dc*dsc*dp*ic*isc*ip*in*
dexter@dexter-Lenovo-G50-80:~$
我也尝试了标记问题中提到的以下步骤，但出现了以下错误：
dexter@dexter-Lenovo-G50-80:~$ wget https://www.dropbox.com/s/dnlvxmw5l7mwn2d/bluetooth.tar.gz
--2015-08-19 14:37:45-- https://www.dropbox.com/s/dnlvxmw5l7mwn2d/bluetooth.tar.gz
Resolving www.dropbox.com (www.dropbox.com)... 108.160.172.238, 108.160.172.206
Connecting to www.dropbox.com (www.dropbox.com)|108.160.172.238|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: unspecified [text/html]
Saving to: ‘bluetooth.tar.gz’
[ <=> ] 85,039 46.0KB/s in 1.8s
2015-08-19 14:37:48 (46.0 KB/s) - ‘bluetooth.tar.gz’ saved [85039]
dexter@dexter-Lenovo-G50-80:~$ tar -zxvf bluetooth.tar.gz
gzip: stdin: not in gzip format
tar: Child returned status 1
tar: Error is not recoverable: exiting now
dexter@dexter-Lenovo-G50-80:~$
请注意，我有双重启动，并且蓝牙在 Windows 中运行良好。
请帮助我。提前致谢。