1、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、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
reboot
二.配置系统更新“源”
在ubuntu（其他linux系统，如Redhat,Open SUSE,Fedora Core也差不多）里，“源”就是指系统更新用的服务器，源地址，自然就是指更新服务器的地址了。
ubuntu“源文件”所在位置： /etc/apt 文件夹，名称：sources.list
1. 编辑源的文件：sudo gedit /etc/apt/sources.list
2. 更新源上的包：sudo apt-get update
3. 备份源的文件：sudo cp /etc/apt/sources.list /etc/apt/sources.list_backup
4. ubuntu 8.10 台湾源。其他的都不稳定，大家想要的话，可以去网上搜索，很多的，我这里只给出我认为最稳定，速度也不错的台湾源：
#Ubuntu.cn99.com 更新服务器(推荐广东电信用户使用。
deb http://ubuntu.cn99.com/ubuntu/ feisty main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ feisty-security main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ feisty-updates main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ feisty-proposed main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ feisty-backports main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ feisty main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ feisty-security main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ feisty-updates main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ feisty-proposed main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ feisty-backports main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu-cn/ feisty main restricted universe multiversedeb http://archive.ubuntu.com/ubuntu/ breezy main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ breezy-security main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ breezy-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ breezy-backports main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu-cn/ breezy main restricted universe multiverse
#台湾官方更新源（强烈推荐大陆电信用户使用）
deb http://tw.archive.ubuntu.com/ubuntu hardy main restricted universe multiverse
deb http://tw.archive.ubuntu.com/ubuntu hardy-security main restricted universe multiverse
deb http://tw.archive.ubuntu.com/ubuntu hardy-updates main restricted universe multiverse
deb http://tw.archive.ubuntu.com/ubuntu hardy-backports main restricted universe multiverse
deb http://tw.archive.ubuntu.com/ubuntu hardy-proposed main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu hardy main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu hardy-security main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu hardy-updates main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu hardy-backports main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu hardy-proposed main restricted universe multiverse
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