OS：Ubuntu 13.10桌面版
无线网卡：Broadcom BCM4312
情况描述：安装完操作系统，发现无法通过WIFI上网。
解决思路：
A)去厂商官网下载和安装Linux版网卡驱动
B)通过搜索引擎去尝试解决问题
解决步骤：
1.去厂商官网下载网卡驱动的Linux版
a)确定无线网卡具体型号
administrator@Stevenash:~$ lspci |grep -i network 10:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01)
b)官网驱动下载并提供安装说明
http://www.broadcom.com/support/802.11/linux_sta.php
c)依照说明编译并安装驱动，由于没有安全成功，忽略相关步骤，报错信息如下：
/home/administrator/Downloads/hybird/src/wl/sys/wl_linux.c:3470:22: warning: assignment makes pointer from integer without a cast [enabled by default]
if ((wl->proc_entry = create_proc_entry(tmp, 0644, NULL)) == NULL) {
^
/home/administrator/Downloads/hybird/src/wl/sys/wl_linux.c:3475:16: error: dereferencing pointer to incomplete type
wl->proc_entry->read_proc = wl_proc_read;
^
/home/administrator/Downloads/hybird/src/wl/sys/wl_linux.c:3476:16: error: dereferencing pointer to incomplete type
wl->proc_entry->write_proc = wl_proc_write;
^
/home/administrator/Downloads/hybird/src/wl/sys/wl_linux.c:3477:16: error: dereferencing pointer to incomplete type
wl->proc_entry->data = wl;
^
cc1: some warnings being treated as errors
make[2]: *** [/home/administrator/Downloads/hybird/src/wl/sys/wl_linux.o] Error 1
make[1]: *** [_module_/home/administrator/Downloads/hybird] Error 2
make[1]: Leaving directory `/usr/src/linux-headers-3.11.0-12-generic'
make: *** [all] Error 22.通过搜索引擎去尝试解决问题,长时间的搜索，终于找到解决方案
http://www.howopensource.com/2012/10/install-broadcom-sta-wireless-driver-in-ubuntu-12-10-12-04/
root@ubuntu:/# sudo apt-get install bcmwl-kernel-source Reading package lists... Done Building dependency tree Reading state information... Done bcmwl-kernel-source is already the newest version. The following packages were automatically installed and are no longer required: linux-headers-generic linux-p_w_picpath-generic Use 'apt-get autoremove' to remove them. 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. root@ubuntu:/# sudo modprobe -r b43 ssb wl root@ubuntu:/# sudo modprobe wl
bcmwl-kernel-source文件存在系统镜像中，需要把系统镜像挂载。由于编译产生的信息太多，有价值内容不多，故重新运行上述命令，只为说明如何操作。
administrator@**:~$ sudo mkdir /media/cdrom administrator@**:~$ sudo mount -o rw,loop /host/ubuntu-13.10-desktop-i386.iso /media/cdrom mount: block device /host/ubuntu-13.10-desktop-i386.iso is write-protected, mounting read-only
