1. 停止 network-manager服务
sudo service network-manager stop
2. 备份一下文件
sudo cp /var/lib/NetworkManager/NetworkManager.state /var/lib/NetworkManager/NetworkManager.state.back
3.删除文件
sudo rm /var/lib/NetworkManager/NetworkManager.state
4.重启服务
sudo service network-manager start
5.重启系统
reboot
6.修改网卡图标在桌面又上角显示
sudo gedit /etc/NetworkManager/NetworkManager.conf
7.把对应的选项修改一下：
managed = true