使用/etc/init.d/networking restart 命令无效 出现如下：
root@ubuntu:~# sudo /etc/init.d/networking restart * Running /etc/init.d/networking restart is deprecated because it may not enable again some interfaces
* Reconfiguring network interfaces... Rather than invoking init scripts through /etc/init.d, use the service(8)
utility, e.g. service smbd reload
Since the script you are attempting to invoke has been converted to an
Upstart job, you may also use the reload(8) utility, e.g. reload smbd
WARNING: ifup -a is disabled in favour of NetworkManager.
Set ifupdown:managed=false in /etc/NetworkManager/NetworkManager.conf.
[ OK ]
可尝试解决方法：
使用命令
先执行 dpkg-reconfigure resolvconf
再执行 sudo ip addr flush dev eth0 && sudo ifdown eth0 && sudo ifup eth0
测试ping