1. sudo vi /etc/apt/source.list 或 sudo vim /etc/apt/source.list(注意备份)
2.更换源.注意版本
3 .sudo apt-get update
4.apt-get upgrade //这个可以不要，因为这样的话glibc都升级了，不是好事
sudo apt-get install update-manager-core
sudo do-release-upgrade
原文件备份：sudo cp /etc/apt/sources.list /etc/apt/sources.list_backup
你在终端里执行 sudo vi /etc/apt/source.list 或 sudo vim /etc/apt/source.list
换完源之后 更新 sudo apt-get update
执行完就 sudo apt-get dist-upgrade 普通升级用apt-get upgrade，发行版升级用apt-get dist-upgrade
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ubuntu 11.04 163源 natty
deb /ubuntu/ natty main restricted universe multiverse
deb /ubuntu/ natty-security main restricted universe multiverse
deb /ubuntu/ natty-updates main restricted universe multiverse
deb /ubuntu/ natty-proposed main restricted universe multiverse
deb /ubuntu/ natty-backports main restricted universe multiverse
#deb-src /ubuntu/ natty main restricted universe multiverse
#deb-src /ubuntu/ natty-security main restricted universe multiverse
#deb-src /ubuntu/ natty-updates main restricted universe multiverse
#deb-src /ubuntu/ natty-proposed main restricted universe multiverse
#deb-src /ubuntu/ natty-backports main restricted universe multiverse
ubuntu 10.10 163源 maverick
deb /ubuntu/ maverick main restricted universe multiverse
deb /ubuntu/ maverick-security main restricted universe multiverse
deb /ubuntu/ maverick-updates main restricted universe multiverse
deb /ubuntu/ maverick-proposed main restricted universe multiverse
deb /ubuntu/ maverick-backports main restricted universe multiverse
#deb-src /ubuntu/ maverick main restricted universe multiverse
#deb-src /ubuntu/ maverick-security main restricted universe multiverse
#deb-src /ubuntu/ maverick-updates main restricted universe multiverse
#deb-src /ubuntu/ maverick-proposed main restricted universe multiverse
#deb-src /ubuntu/ maverick-backports main restricted universe multiverse
ubuntu 10.04 163源 lucid
deb /ubuntu/ lucid main universe restricted multiverse
deb /ubuntu/ lucid-security universe main multiverse restricted
deb /ubuntu/ lucid-updates universe main multiverse restricted
deb /ubuntu/ lucid-proposed universe main multiverse restricted
deb /ubuntu/ lucid-backports universe main multiverse restricted
#deb-src /ubuntu/ lucid main universe restricted multiverse
#deb-src /ubuntu/ lucid-security universe main multiverse restricted
#deb-src /ubuntu/ lucid-updates universe main multiverse restricted
#deb-src /ubuntu/ lucid-proposed universe main multiverse restricted
#deb-src /ubuntu/ lucid-backports universe main multiverse restricted
ubuntu 9.10 163源 karmic
deb /ubuntu/ karmic main restricted universe multiverse
deb /ubuntu/ karmic-security main restricted universe multiverse
deb /ubuntu/ karmic-updates main restricted universe multiverse
deb /ubuntu/ karmic-proposed main restricted universe multiverse
deb /ubuntu/ karmic-backports main restricted universe multiverse
#deb-src /ubuntu/ karmic main restricted universe multiverse
#deb-src /ubuntu/ karmic-security main restricted universe multiverse
#deb-src /ubuntu/ karmic-updates main restricted universe multiverse
#deb-src /ubuntu/ karmic-proposed main restricted universe multiverse
#deb-src /ubuntu/ karmic-backports main restricted universe multiverse
Ubuntu 9.04 163源jaunty
deb /Ubuntu/ jaunty main restricted universe multiverse
deb /Ubuntu/ jaunty-security main restricted universe multiverse
deb /Ubuntu/ jaunty-updates main restricted universe multiverse
deb /Ubuntu/ jaunty-proposed main restricted universe multiverse
deb /Ubuntu/ jaunty-backports main restricted universe multiverse
#deb-src /Ubuntu/ jaunty main restricted universe multiverse
#deb-src /Ubuntu/ jaunty-security main restricted universe multiverse
#deb-src /Ubuntu/ jaunty-updates main restricted universe multiverse
#deb-src /Ubuntu/ jaunty-proposed main restricted universe multiverse
#deb-src /Ubuntu/ jaunty-backports main restricted universe multiverse
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