ubuntu12.04 apt 换源

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##修改源地址: 1 2 3 :::text cp /etc/apt/sources.list /etc/apt/sources.list.bak vim /etc/apt/sources.list ###官方源 1 2 3 4 5 6 7 8 9 10 11 :::text deb http://archive.ubuntu.com/ubuntu/ precise main restricted universe multiverse deb http://archive.ubuntu.com/ubuntu/ precise-security main restricted universe……