1 国内比较快的源
我的orangepi 2 的 lubuntu是适用的
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ trusty main multiverse restricted universe
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ trusty-backports main multiverse restricted universe
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ trusty-proposed main multiverse restricted universe
deb http://mirrors.ustc.edu.cn/ubuntu-ports trusty-security main multiverse restricted universe
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ trusty-updates main multiverse restricted universe
deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ trusty main multiverse restricted universe
deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ trusty-backports main multiverse restricted universe
deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ trusty-proposed main multiverse restricted universe
deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ trusty-security main multiverse restricted universe
deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ trusty-updates main multiverse restricted universe2
在树莓派上装了Ubuntu 14.04
自带的源在http://ports.ubuntuo.org/ 速度奇慢无比
但由于armhf的源实在稀少，国内反正是没找到
只找到两个国外的，希望能稍微提升点速度吧
方法：
在/etc/apt/source.list.d/中添加文件trusty_source.list，内容：
[plain] view plain copy
deb http://mirrors.mit.edu/ubuntu-ports/ trusty main restricted universe multiverse
deb http://mirrors.mit.edu/ubuntu-ports/ trusty-updates main restricted universe multiverse
deb http://mirrors.mit.edu/ubuntu-ports/ trusty-security main restricted universe multiverse
deb http://mirrors.mit.edu/ubuntu-ports/ trusty-backports main restricted universe multiverse
deb http://mirror.csclub.uwaterloo.ca/ubuntu-ports/ trusty main restricted universe multiverse
deb http://mirror.csclub.uwaterloo.ca/ubuntu-ports/ trusty-updates main restricted universe multiverse
deb http://mirror.csclub.uwaterloo.ca/ubuntu-ports/ trusty-security main restricted universe multiverse
deb http://mirror.csclub.uwaterloo.ca/ubuntu-ports/ trusty-backports main restricted universe multiverse