ubuntu 无线 网络已被禁用 解决办法

dengpei@dengpei-laptop:~$ sudo -s
[sudo] password for dengpei: 
root@dengpei-laptop:~# service network-manager
Usage: /etc/init.d/network-manager COMMAND
root@dengpei-laptop:~# service network-manager stop
network-manager stop/waiting
root@dengpei-laptop:~# service network-manager start
network-manager start/running, process 1918
root@dengpei-laptop:~# service network-manager stop
network-manager stop/waiting
root@dengpei-laptop:~# rm /var/lib/NetworkManager/NetworkManager.state 
root@dengpei-laptop:~# service network-manager start
network-manager start/running, process 1951
root@dengpei-laptop:~#