$ cd /etc/apt/ $ vim sources.list # 复制粘贴下面的↓↓↓ deb http://cn.archive.ubuntu.com/ubuntu/ precise main restricted universe multiverse deb http://cn.archive.ubuntu.com/ubuntu/ precise-security main restricted universe multiverse deb http://cn.archive.ubuntu.com/ubuntu/ precise-updates main restricted universe multiverse deb http://cn.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse # 测试版源 deb http://cn.archive.ubuntu.com/ubuntu/ precise-proposed main restricted universe multiverse # 源码 deb-src http://cn.archive.ubuntu.com/ubuntu/ precise main restricted universe multiverse deb-src http://cn.archive.ubuntu.com/ubuntu/ precise-security main restricted universe multiverse deb-src http://cn.archive.ubuntu.com/ubuntu/ precise-updates main restricted universe multiverse deb-src http://cn.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse # 测试版源 deb-src http://cn.archive.ubuntu.com/ubuntu/ precise-proposed main restricted universe multiverse # Canonical 合作伙伴和附加 deb http://archive.canonical.com/ubuntu/ precise partner deb http://extras.ubuntu.com/ubuntu/ precise main