更新后一定要：apt-get update

## deb cdrom:[Ubuntu-Server 12.04.5 LTS _Precise Pangolin_ - Release amd64 (20140806.1)]/ dists/precise/main/binary-i386/# deb cdrom:[Ubuntu-Server 12.04.5 LTS _Precise Pangolin_ - Release amd64 (20140806.1)]/ dists/precise/restricted/binary-i386/# deb cdrom:[Ubuntu-Server 12.04.5 LTS _Precise Pangolin_ - Release amd64 (20140806.1)]/ precise main restricted#deb cdrom:[Ubuntu-Server 12.04.5 LTS _Precise Pangolin_ - Release amd64 (20140806.1)]/ dists/precise/main/binary-i386/#deb cdrom:[Ubuntu-Server 12.04.5 LTS _Precise Pangolin_ - Release amd64 (20140806.1)]/ dists/precise/restricted/binary-i386/#deb cdrom:[Ubuntu-Server 12.04.5 LTS _Precise Pangolin_ - Release amd64 (20140806.1)]/ precise 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/ precise main restricteddeb-src http://cn.archive.ubuntu.com/ubuntu/ precise main restricted## Major bug fix updates produced after the final release of the## distribution.deb http://cn.archive.ubuntu.com/ubuntu/ precise-updates main restricteddeb-src http://cn.archive.ubuntu.com/ubuntu/ precise-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/ precise universedeb-src http://cn.archive.ubuntu.com/ubuntu/ precise universedeb http://cn.archive.ubuntu.com/ubuntu/ precise-updates universedeb-src http://cn.archive.ubuntu.com/ubuntu/ precise-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/ precise multiversedeb-src http://cn.archive.ubuntu.com/ubuntu/ precise multiversedeb http://cn.archive.ubuntu.com/ubuntu/ precise-updates multiversedeb-src http://cn.archive.ubuntu.com/ubuntu/ precise-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/ precise-backports main restricted universe multiversedeb-src http://cn.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiversedeb http://security.ubuntu.com/ubuntu precise-security main restricteddeb-src http://security.ubuntu.com/ubuntu precise-security main restricteddeb http://security.ubuntu.com/ubuntu precise-security universedeb-src http://security.ubuntu.com/ubuntu precise-security universedeb http://security.ubuntu.com/ubuntu precise-security multiversedeb-src http://security.ubuntu.com/ubuntu precise-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 precise partner# deb-src http://archive.canonical.com/ubuntu precise 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 precise main# deb-src http://extras.ubuntu.com/ubuntu precise maindeb http://ppa.launchpad.net/dominik-stadler/subversion-1.8/ubuntu/ precise main