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cd /etc/apt进入配置目录
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cp ./sources.list ./sources.list.backup备份默认源列表文件
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rm ./sources.list删除默认源列表文件
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vim ./sources.list新建源列表文件，拷贝以下内容并保存（注：以北理工的源为例）
deb http://mirror.bit.edu.cn/ubuntu/ precise main restricted
deb http://mirror.bit.edu.cn/ubuntu/ precise-updates main restricted
deb http://mirror.bit.edu.cn/ubuntu/ precise universe
deb http://mirror.bit.edu.cn/ubuntu/ precise-updates universe
deb http://mirror.bit.edu.cn/ubuntu/ precise multiverse
deb http://mirror.bit.edu.cn/ubuntu/ precise-updates multiverse
deb http://mirror.bit.edu.cn/ubuntu/ precise-backports main restricted universe multiverse
deb http://mirror.bit.edu.cn/ubuntu/ precise-security main restricted
deb http://mirror.bit.edu.cn/ubuntu/ precise-security universe
deb http://mirror.bit.edu.cn/ubuntu/ precise-security multiverse
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sudo apt-get update更新包依赖关系
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