deb http://cn.archive.ubuntu.com/ubuntu/ trusty main restricted universe multiversedeb http://cn.archive.ubuntu.com/ubuntu/ trusty-security main restricted universe multiversedeb http://cn.archive.ubuntu.com/ubuntu/ trusty-updates main restricted universe multiversedeb http://cn.archive.ubuntu.com/ubuntu/ trusty-proposed main restricted universe multiversedeb http://cn.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse

转自： http://www.tuicool.com/articles/AFRzUjI