ubuntu 12.04 无法打开无线，解决办法

1.在terminal里面输入ifconfig，将会看以下信息（可能会有一些不同，没有关系）：

eth0 Link encap:Ethernet HWaddr 00:24:be:b8:2f:d3

UP BROADCAST MULTICAST MTU:1500 Metric:1

RX packets:0 errors:0 dropped:0 overruns:0 frame:0

TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

Interrupt:16

lo Link encap:Local Loopback

inet addr:127.0.0.1 Mask:255.0.0.0

inet6 addr: ::1/128 Scope:Host

UP LOOPBACK RUNNING MTU:16436 Metric:1

RX packets:304 errors:0 dropped:0 overruns:0 frame:0

TX packets:304 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:0

RX bytes:18672 (18.6 KB) TX bytes:18672 (18.6 KB)

2.在终端输入rfkill list，你又会看到两个信息：

0: sony-wifi: Wireless LAN

Soft blocked: yes

Hard blocked: no

1: phy0: Wireless LAN

Soft blocked: no

Hard blocked: yes

输入，rfkill help ，将会看到这个rfkill支持的命令：

help

event

list [IDENTIFIER]

block IDENTIFIER

unblock IDENTIFIER

输入：

rfkill unblock 0

rfkill unblock 1

这是为了确保把以下这些都关上

0: sony-wifi: Wireless LAN

Soft blocked: no

Hard blocked: no

1: phy0: Wireless LAN

Soft blocked: no

Hard blocked: no

然后再打开（无线）网卡：rfkill block 1

OK 可以无线网了