Ubuntu 12.04.5安装TL-WN725N 2.0无线网卡驱动

实验室有线网络用不了。新配的台式机昨天刚到手。为了让该台式机能用上实验室的无线网络，只好新买了个TP-LINK无线USB网卡。按自带的说明书和提供的网卡，Win7下很简单。但我还装了Ubuntu，考虑不周，该网卡居然没提供Linux驱动。各种Google后终于找到解决方案，希望为后来人提供一点线索，少走弯路。

系统环境：Ubuntu 12.04.5 64位

系统内核：Linux kernel 3.13.0-32-generic

确认无线网卡型号：TL-WN725N 2.0。这商品包装上的图片型号和实物不太一样，估计驱动也就大同小异！

驱动安装步骤：

1) 查看硬件型号。开始在 http://wiki.ubuntu.org.cn/UbuntuHelp:WifiDocs/Driver/bcm43xx 看了，不太明白它分的2类似乎与我的型号都无关。因为我的无线网卡是USB插口，可以通过如下方式查看我的无线网卡型号：

$ lsusb

Bus 001 Device 002: ID 8087:8008 Intel Corp.

Bus 002 Device 002: ID 8087:8000 Intel Corp.

Bus 003 Device 004: ID 0781:5530 SanDisk Corp. Cruzer

Bus 003 Device 002: ID 09da:c10a A4 Tech Co., Ltd

Bus 003 Device 003: ID0bda:8179 Realtek Semiconductor Corp.

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub

$ lspci

00:00.0 Host bridge: Intel Corporation 4th Gen Core Processor DRAM Controller (rev 06)

00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor PCI Express x16 Controller (rev 06)

00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller (rev 06)

00:03.0 Audio device: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor HD Audio Controller (rev 06)

00:14.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB xHCI (rev 05)

00:16.0 Communication controller: Intel Corporation 8 Series/C220 Series Chipset Family MEI Controller #1 (rev 04)

00:1a.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #2 (rev 05)

00:1b.0 Audio device: Intel Corporation 8 Series/C220 Series Chipset High Definition Audio Controller (rev 05)

00:1c.0 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #1 (rev d5)

00:1c.2 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #3 (rev d5)