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查看一小时内日志：
sudo journalctl -u network.service --since "1 hour ago"
且通过systemctl restart network.service启动网络失败（ping不通）
systemctl restart network Job for network.service failed because the control process exited with error code. See "systemctl status network.service" and "journalctl -xe" for details.
出现：Failed to start LSB: Bring up/down networking.
一般是和networkManager 有冲突导致的，只需要把networkManager服务给停掉，再重启网络服务就可以了。
systemctl stop NetworkManager
systemctl restart network.service
2.也有可能是没设置开启启动网卡，可以去配置文件查看