方法1 修改/etc/apt/sources.list文件

sudo vim /etc/apt/sources.list

然后添加如下代码

deb http://ftp.neowiz.com/raspbian/raspbian wheezy main contrib non-free rpi
deb-src http://ftp.neowiz.com/raspbian/raspbian wheezy main contrib non-free rpi

使修改生效，执行如下命令

sudo apt-get update

方法2 在/etc/apt/sources.list.d/中增加一个新的.list文件指定源,使新配置生效sudo apt-get update

Raspbian源列表
http://www.raspbian.org/RaspbianMirrors

官方源：

deb http://archive.raspbian.org/raspbian wheezy main contrib non-free rpi
deb-src http://archive.raspbian.org/raspbian wheezy main contrib non-free rpi

目前最快的Raspbian源：
http://ftp.neowiz.com/raspbian/raspbian/

deb http://ftp.neowiz.com/raspbian/raspbian wheezy main contrib non-free rpi
deb-src http://ftp.neowiz.com/raspbian/raspbian wheezy main contrib non-free rpi

出现gcc-4.7依赖库错误的解决办法
错误如下：

E: Internal Error, No file name for gcc-4.7-base

解决办法：

# apt-get download libstdc++6 libgcc1 gcc-4.7-base
# dpkg -i *.deb
# apt-get -f install (这一步完成后，可解决依赖关系错误的问题，下一步开始正常升级)
# apt-get dist-upgrade