依然是8.04，今天安装后突然发现一起常用的apt-get install g++都无法安装了。。。
以为是ubuntu服务器的问题，在10.04下一起正常，于是把10.4下的/etc/apt/sources.list,拷贝出来：
#deb cdrom:[Ubuntu 10.04 LTS _Lucid Lynx_ - Release i386 (20100429)]/ lucid 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/ lucid main restricteddeb-src http://cn.archive.ubuntu.com/ubuntu/ lucid main restricted## Major bug fix updates produced after the final release of the## distribution.deb http://cn.archive.ubuntu.com/ubuntu/ lucid-updates main restricteddeb-src http://cn.archive.ubuntu.com/ubuntu/ lucid-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/ lucid universedeb-src http://cn.archive.ubuntu.com/ubuntu/ lucid universedeb http://cn.archive.ubuntu.com/ubuntu/ lucid-updates universedeb-src http://cn.archive.ubuntu.com/ubuntu/ lucid-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/ lucid multiversedeb-src http://cn.archive.ubuntu.com/ubuntu/ lucid multiversedeb http://cn.archive.ubuntu.com/ubuntu/ lucid-updates multiversedeb-src http://cn.archive.ubuntu.com/ubuntu/ lucid-updates multiverse## Uncomment the following two lines to add software from the 'backports'## repository.## 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/ lucid-backports main restricted universe multiverse# deb-src http://cn.archive.ubuntu.com/ubuntu/ lucid-backports main restricted universe 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 lucid partner# deb-src http://archive.canonical.com/ubuntu lucid partnerdeb http://security.ubuntu.com/ubuntu lucid-security main restricteddeb-src http://security.ubuntu.com/ubuntu lucid-security main restricteddeb http://security.ubuntu.com/ubuntu lucid-security universedeb-src http://security.ubuntu.com/ubuntu lucid-security universedeb http://security.ubuntu.com/ubuntu lucid-security multiversedeb-src http://security.ubuntu.com/ubuntu lucid-security multiverse
覆盖8.04里面的/etc/apt/sources.list
然后：apt-get update
搞定！