Ubuntu原带的apt源地址很多软件下不了，不好用，网上找了一大堆的国内源地址，有些也不能用，试了很多终于找到一个合适的，所以记录一下以免忘记。
deb http://mirrors.yun-idc.com/ubuntu/ wily main restricted universe multiverse
deb http://mirrors.yun-idc.com/ubuntu/ wily-security main restricted universe multiverse
deb http://mirrors.yun-idc.com/ubuntu/ wily-updates main restricted universe multiverse
deb http://mirrors.yun-idc.com/ubuntu/ wily-proposed main restricted universe multiverse
deb http://mirrors.yun-idc.com/ubuntu/ wily-backports main restricted universe multiverse
deb-src http://mirrors.yun-idc.com/ubuntu/ wily main restricted universe multiverse
deb-src http://mirrors.yun-idc.com/ubuntu/ wily-security main restricted universe multiverse
deb-src http://mirrors.yun-idc.com/ubuntu/ wily-updates main restricted universe multiverse
deb-src http://mirrors.yun-idc.com/ubuntu/ wily-proposed main restricted universe multiverse
deb-src http://mirrors.yun-idc.com/ubuntu/ wily-backports main restricted universe multiverse