#deb cdrom:[Ubuntu 16.04.1 LTS _Xenial Xerus_ - Release amd64 (20160719)]/ 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, 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## 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 universedeb http://cn.archive.ubuntu.com/ubuntu/ xenial-updates universe# deb-src http://cn.archive.ubuntu.com/ubuntu/ xenial-updates universe