ubuntu14.04 arm中国科技大学源：
1deb http://mirrors.ustc.edu.cn/ubuntu-ports/ trusty main multiverse restricted universe 2deb http://mirrors.ustc.edu.cn/ubuntu-ports/ trusty-backports main multiverse restricted universe 3deb http://mirrors.ustc.edu.cn/ubuntu-ports/ trusty-proposed main multiverse restricted universe 4deb http://mirrors.ustc.edu.cn/ubuntu-ports/ trusty-security main multiverse restricted universe 5deb http://mirrors.ustc.edu.cn/ubuntu-ports/ trusty-updates main multiverse restricted universe 6deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ trusty main multiverse restricted universe 7deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ trusty-backports main multiverse restricted universe 8deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ trusty-proposed main multiverse restricted universe 9deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ trusty-security main multiverse restricted universe 10deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ trusty-updates main multiverse restricted universe
将上面代码复制到ubuntu arm系统的/etc/apt/sources.list中，将以前的注释掉。
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