1. 获取root权限
1. 设置root密码：打开终端，输入：sudo passwd root，按照提示分别输入当前账号密码和root账号密码
2. 登陆root账号：在终端输入：su，回车后按照提示输入设置好的密码，即切换到root账号
2. 更新软件源
1. 获取网易unbuntu源：http://mirrors.163.com/
2. 根据版本选择：以下为14.04版本
deb http://mirrors.163.com/ubuntu/ trusty main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ trusty-security main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ trusty-updates main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ trusty-proposed main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ trusty-backports main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ trusty main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ trusty-security main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ trusty-updates main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ trusty-proposed main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ trusty-backports main restricted universe multiverse
3. 备份源列表文件
sudo cp /etc/apt/sources.list /etc/apt/sources.list_backup
4. 用网易源覆盖官方源，使用gedit编辑后保存
sudo gedit /etc/apt/sources.list
5. 更新源
sudo apt-get update
sudo apt-get upgrade（更新软件，非必须）