ubuntu 12.04设置默认字符启动，设置静态ip，更换源

设置为默认字符界面启动的做法：
（1）、查看文件/etc/init/rc-sysinit.conf，在第14行附近：确认“env DEFAULT_RUNLEVEL=2”。2是新装系统默认的，确保不被修改。
（2）、编辑文件 /etc/init/lightdm.conf，在第12行附近，原句“ and runlevel [!06]” 改为“ and runlevel [!026]”。

设置静态ip的做法：
（1）修改/etc/network/interfaces文件，向结尾追加：

auto eth0

iface eth0 inet static

address 192.168.0.33

gateway 192.168.0.1

netmask 255.255.255.0

network 192.168.0.0

broadcast 192.168.0.255

其中的ip地址不一定如上面这样

（2）修改DNS，文件是/etc/resolvconf/resolv.conf.d/base

写入：

nameserver 192.168.80.2
nameserver 8.8.8.8

更换源：

文件/etc/apt/sources.list

网易源：

deb http://mirrors.163.com/ubuntu/ precise main universe restricted multiverse 

deb-src http://mirrors.163.com/ubuntu/ precise main universe restricted multiverse 

deb http://mirrors.163.com/ubuntu/ precise-security universe main multiverse restricted 

deb-src http://mirrors.163.com/ubuntu/ precise-security universe main multiverse restricted 

deb http://mirrors.163.com/ubuntu/ precise-updates universe main multiverse restricted 

deb http://mirrors.163.com/ubuntu/ precise-proposed universe main multiverse restricted 

deb-src http://mirrors.163.com/ubuntu/ precise-proposed universe main multiverse restricted 

deb http://mirrors.163.com/ubuntu/ precise-backports universe main multiverse restricted 

deb-src http://mirrors.163.com/ubuntu/ precise-backports universe main multiverse restricted 

deb-src http://mirrors.163.com/ubuntu/ precise-updates universe main multiverse restricted