第一步、查看状态
代码：rfkill list
rpeter@www.linuxidc.com:~$ rfkill list
0: hp-wi: Wireless LAN
Soft blocked: yes
Hard blocked: yes
1: phy0: Wireless LAN
Soft blocked: yes
Hard blocked: yes
soft block 问题：rfkill unblock all 干掉所有软件 block
Hard block 问题： Fn+F2 解决 (明明 laptop 有 wi 的硬件开关，Linux 还是默认这对
冤家当硬件开关)
再使用 rfkill list 查看均变为 no
rpeter@www.linuxidc.com:~$ rfkill list
0: hp-wi: Wireless LAN
Soft blocked: no
Hard blocked: no
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
第二步、如果第一步已经解决了就不用进行第二步了
依次输入如下代码，之后注销即可
sudo service network-manager stop
sudo rm /var/lib/NetworkManager/NetworkManager.state
sudo service network-manager start
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