1、ubuntu系统修改IP地址：sudo gedit /etc/network/interfaces
auto eth0
iface eth0 inet static
address 219.218.122.168
netmask 255.255.255.0
gateway 219.218.122.254
2、ubuntu系统修改DNS： sudo gedit /etc/resolv.conf
nameserver 202.194.15.12
3、使网络生效：sudo /etc/init.d/networking restart
Ubuntu8.04虚拟机更换host主机后开机无法加载网卡,提示:No such device
删除缓存文件，重启后解决。
sudo rm /etc/udev/rules.d/70-persistent-net.rules
重启电脑：sudo reboot