1.查看ubuntu版本:
cat /etc/issue
2.看网卡型号:
主菜单->软件与更新->附加驱动
3.搜索得到结果:
sudo apt-get purge bcmwl-kernel-source broadcom-sta-common broadcom-sta-source
sudo apt-get install b43-fwcutter firmware-b43-installer
参考下图Broadcom B43 WiFi not working in Ubuntu 14.04 LTS的讨论: