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deb http://debian.ustc.edu.cn/ubuntu/ xenial main multiverse restricted universe deb http://debian.ustc.edu.cn/ubuntu/ xenial-backports main multiverse restricted universe deb http://debian.ustc.edu.cn/ubuntu/ xenial-proposed main multiverse restricted universe deb http://debian.ustc.edu.cn/ubuntu/ xenial-security main multiverse restricted universe deb http://debian.ustc.edu.cn/ubuntu/ xenial-updates main multiverse restricted universe deb-src http://debian.ustc.edu.cn/ubuntu/ xenial main multiverse restricted universe deb-src http://debian.ustc.edu.cn/ubuntu/ xenial-backports main multiverse restricted universe deb-src http://debian.ustc.edu.cn/ubuntu/ xenial-proposed main multiverse restricted universe deb-src http://debian.ustc.edu.cn/ubuntu/ xenial-security main multiverse restricted universe deb-src http://debian.ustc.edu.cn/ubuntu/ xenial-updates main multiverse restricted universe
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# # deb cdrom:[Ubuntu-Server 16.04.5 LTS _xenial Tahr_ - Release amd64 (20160803)]/ xenial main restricted #deb cdrom:[Ubuntu-Server 16.04.5 LTS _xenial Tahr_ - Release amd64 (20160803)]/ xenial main restricted # See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to # newer versions of the distribution. deb http://cn.archive.ubuntu.com/ubuntu/ xenial main restricted deb-src http://cn.archive.ubuntu.com/ubuntu/ xenial main restricted ## Major bug fix updates produced after the final release of the ## distribution. deb http://cn.archive.ubuntu.com/ubuntu/ xenial-updates main restricted deb-src http://cn.archive.ubuntu.com/ubuntu/ xenial-updates main restricted ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu ## team. Also, please note that software in universe WILL NOT receive any ## review or updates from the Ubuntu security team. deb http://cn.archive.ubuntu.com/ubuntu/ xenial universe deb-src http://cn.archive.ubuntu.com/ubuntu/ xenial universe deb http://cn.archive.ubuntu.com/ubuntu/ xenial-updates universe deb-src http://cn.archive.ubuntu.com/ubuntu/ xenial-updates universe ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu ## team, and may not be under a free licence. Please satisfy yourself as to ## your rights to use the software. Also, please note that software in ## multiverse WILL NOT receive any review or updates from the Ubuntu ## security team. deb http://cn.archive.ubuntu.com/ubuntu/ xenial multiverse deb-src http://cn.archive.ubuntu.com/ubuntu/ xenial multiverse deb http://cn.archive.ubuntu.com/ubuntu/ xenial-updates multiverse deb-src http://cn.archive.ubuntu.com/ubuntu/ xenial-updates multiverse ## N.B. software from this repository may not have been tested as ## extensively as that contained in the main release, although it includes ## newer versions of some applications which may provide useful features. ## Also, please note that software in backports WILL NOT receive any review ## or updates from the Ubuntu security team. deb http://cn.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse deb-src http://cn.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse deb http://security.ubuntu.com/ubuntu xenial-security main restricted deb-src http://security.ubuntu.com/ubuntu xenial-security main restricted deb http://security.ubuntu.com/ubuntu xenial-security universe deb-src http://security.ubuntu.com/ubuntu xenial-security universe deb http://security.ubuntu.com/ubuntu xenial-security multiverse deb-src http://security.ubuntu.com/ubuntu xenial-security multiverse ## Uncomment the following two lines to add software from Canonical's ## 'partner' repository. ## This software is not part of Ubuntu, but is offered by Canonical and the ## respective vendors as a service to Ubuntu users. # deb http://archive.canonical.com/ubuntu xenial partner # deb-src http://archive.canonical.com/ubuntu xenial partner ## Uncomment the following two lines to add software from Ubuntu's ## 'extras' repository. ## This software is not part of Ubuntu, but is offered by third-party ## developers who want to ship their latest software. # deb http://extras.ubuntu.com/ubuntu xenial main # deb-src http://extras.ubuntu.com/ubuntu xenial main
但谈何容易。