1.ubuntu在启动网卡的时候出现reconfiguring network interfaces.如果ping不通外网那么说明配置的网卡错误了，重新检查下网卡配置.

2.dns配置sudo vi /etc/resolv.conf

nameserver 114.114.114.114

nameserver 8.8.8.8

3.ip配置sudo vi /etc/network/interfaces

iface eth0 inet static

address 192.168.0.108

gateway 192.168.0.1

netmask 255.255.255.0

3.ubuntu的基本网卡配置就如所上.centos略有不同,要求大写,有等号,ip配置项为IPADDR.