安装完Ubuntu9.04后，进入桌面，当然第一步是设置好源，我的源如下：
官方的：
deb
http://archive.linux.duke.edu/ubuntu/ jaunty main restricteduniverse multiverse
deb
http://archive.linux.duke.edu/ubuntu/ jaunty-security mainrestricted universe multiverse
deb
http://archive.linux.duke.edu/ubuntu/ jaunty-updates mainrestricted universe multiverse
deb
http://archive.linux.duke.edu/ubuntu/ jaunty-backports mainrestricted universe multiverse
deb
http://archive.linux.duke.edu/ubuntu/ jaunty-proposed mainrestricted universe multiverse
deb-src
http://archive.linux.duke.edu/ubuntu/ jaunty mainrestricted universe multiverse
deb-src
http://archive.linux.duke.edu/ubuntu/ jaunty-security mainrestricted universe multiverse
deb-src
http://archive.linux.duke.edu/ubuntu/ jaunty-updates mainrestricted universe multiverse
deb-src
http://archive.linux.duke.edu/ubuntu/ jaunty-backports mainrestricted universe multiverse
台湾的：
deb
http://debian.nctu.edu.tw/ubuntu/ jaunty multiverse
deb
http://debian.nctu.edu.tw/ubuntu/ jaunty-securitymultiverse
deb
http://debian.nctu.edu.tw/ubuntu/ jaunty-updatesmultiverse
deb
http://debian.nctu.edu.tw/ubuntu/ jaunty-proposedmultiverse
deb
http://debian.nctu.edu.tw/ubuntu/ jaunty-backportsmultiverse
deb-src
http://debian.nctu.edu.tw/ubuntu/ jaunty multiverse
deb-src
http://debian.nctu.edu.tw/ubuntu/ jaunty-securitymultiverse
deb-src
http://debian.nctu.edu.tw/ubuntu/ jaunty-updatesmultiverse
deb-src
http://debian.nctu.edu.tw/ubuntu/ jaunty-proposedmultiverse
deb-src
http://debian.nctu.edu.tw/ubuntu/ jaunty-backportsmultiverse
官方二：
deb
http://mirror.lupaworld.com/ubuntu/ jaunty multiverse
deb-src
http://mirror.lupaworld.com/ubuntu/ jaunty multiverse#Added by software-properties
deb
http://mirror.lupaworld.com/ubuntu/ jaunty-securitymultiverse
deb-src
http://mirror.lupaworld.com/ubuntu/ jaunty-securitymultiverse #Added by software-properties
deb
http://mirror.lupaworld.com/ubuntu/ jaunty-updatesmultiverse
deb-src
http://mirror.lupaworld.com/ubuntu/ jaunty-updatesmultiverse #Added by software-properties
deb
http://mirror.lupaworld.com/ubuntu/ jaunty-proposedmultiverse
deb-src
http://mirror.lupaworld.com/ubuntu/ jaunty-proposedmultiverse #Added by software-properties
deb
http://mirror.lupaworld.com/ubuntu/ jaunty-backportsmultiverse
deb-src
http://mirror.lupaworld.com/ubuntu/ jaunty-backportsmultiverse #Added by software-properties
deb
http://mirror.lupaworld.com/ubuntu/ jaunty main restricteduniverse
deb-src
http://mirror.lupaworld.com/ubuntu/ jaunty main restricteduniverse #Added by software-properties
deb
http://mirror.lupaworld.com/ubuntu/ jaunty-security mainrestricted universe
deb-src
http://mirror.lupaworld.com/ubuntu/ jaunty-security mainrestricted universe #Added by software-properties
deb
http://mirror.lupaworld.com/ubuntu/ jaunty-updates mainrestricted universe
deb-src
http://mirror.lupaworld.com/ubuntu/ jaunty-updates mainrestricted universe #Added by software-properties
deb
http://mirror.lupaworld.com/ubuntu/ jaunty-backports mainrestricted universe
deb-src
http://mirror.lupaworld.com/ubuntu/ jaunty-backports mainrestricted universe #Added by software-properties
deb
http://mirror.lupaworld.com/ubuntu/ jaunty-proposed mainrestricted universe
deb-src
http://mirror.lupaworld.com/ubuntu/ jaunty-proposed mainrestricted universe #Added by software-properties
德国的：
deb
http://archive.ubuntu.uasw.edu/ jaunty main restricted universemultiverse
deb-src
http://archive.ubuntu.uasw.edu/ jaunty main restricteduniverse multiverse #Added by software-properties
deb
http://archive.ubuntu.uasw.edu/ jaunty-security main restricteduniverse multiverse
deb-src
http://archive.ubuntu.uasw.edu/ jaunty-security mainrestricted universe multiverse #Added by software-properties
deb
http://archive.ubuntu.uasw.edu/ jaunty-updates main restricteduniverse multiverse
deb-src
http://archive.ubuntu.uasw.edu/ jaunty-updates mainrestricted universe multiverse #Added by software-properties
deb
http://archive.ubuntu.uasw.edu/ jaunty-backports mainrestricted universe multiverse
deb-src
http://archive.ubuntu.uasw.edu/ jaunty-backports mainrestricted universe multiverse #Added by software-properties
deb
http://archive.ubuntu.uasw.edu/ jaunty-proposed main restricteduniverse multiverse
deb-src
http://archive.ubuntu.uasw.edu/ jaunty-proposed mainrestricted universe multiverse #Added by software-properties
法国的：
deb
http://archive.monubuntu.fr/ jaunty main restricted universemultiverse
deb-src
http://archive.monubuntu.fr/ jaunty main restricteduniverse multiverse #Added by software-properties
deb
http://archive.monubuntu.fr/ jaunty-security main restricteduniverse multiverse
deb-src
http://archive.monubuntu.fr/ jaunty-security mainrestricted universe multiverse #Added by software-properties
deb
http://archive.monubuntu.fr/ jaunty-updates main restricteduniverse multiverse
deb-src
http://archive.monubuntu.fr/ jaunty-updates main restricteduniverse multiverse #Added by software-properties
deb
http://archive.monubuntu.fr/ jaunty-backports main restricteduniverse multiverse
deb-src
http://archive.monubuntu.fr/ jaunty-backports mainrestricted universe multiverse #Added by software-properties
deb
http://archive.monubuntu.fr/ jaunty-proposed main restricteduniverse multiverse
deb-src
http://archive.monubuntu.fr/ jaunty-proposed mainrestricted universe multiverse #Added by software-properties
韩国的：
deb
http://kr.archive.ubuntu.com/ubuntu/ jaunty main restricteduniverse multiverse
deb-src
http://kr.archive.ubuntu.com/ubuntu/ jaunty main restricteduniverse multiverse #Added by software-properties
deb
http://kr.archive.ubuntu.com/ubuntu/ jaunty-security mainrestricted universe multiverse
deb-src
http://kr.archive.ubuntu.com/ubuntu/ jaunty-security mainrestricted universe multiverse #Added by software-properties
deb
http://kr.archive.ubuntu.com/ubuntu/ jaunty-updates mainrestricted universe multiverse
deb-src
http://kr.archive.ubuntu.com/ubuntu/ jaunty-updates mainrestricted universe multiverse #Added by software-properties
deb
http://kr.archive.ubuntu.com/ubuntu/ jaunty-backports mainrestricted universe multiverse
deb-src
http://kr.archive.ubuntu.com/ubuntu/ jaunty-backports mainrestricted universe multiverse #Added by software-properties
deb
http://kr.archive.ubuntu.com/ubuntu/ jaunty-proposed mainrestricted universe multiverse
deb-src
http://kr.archive.ubuntu.com/ubuntu/ jaunty-proposed mainrestricted universe multiverse #Added by software-properties
PPA源：
deb
http://ppa.launchpad.net/awn-testing/ppa/ubuntu jaunty main#avant-window-navigator
deb
http://ppa.launchpad.net/globalmenu-team/ppa/ubuntu jaunty main#gnome-globalmenu
deb
http://ppa.launchpad.net/chromium-daily/ppa/ubuntu jaunty main#chromium-browser
deb
http://ppa.launchpad.net/specto/ppa/ubuntu jaunty main#specto
deb
http://deb.opera.com/opera/ lenny non-free #opera
deb
http://ppa.launchpad.net/fta/ubuntu jaunty main #firefox
deb
http://ppa.launchpad.net/compiz/ubuntu jaunty main#compiz-fusion
deb
http://ppa.launchpad.net/do-core/ubuntu jaunty main#gnome-do
deb
http://dl.google.com/linux/deb/ stable non-free #google
deb
http://ppa.launchpad.net/shutter/ppa/ubuntu jaunty main#shutter
deb
http://packages.medibuntu.org/ jaunty free non-free#medibuntu
上面的是各个国家的源，最下面的是PPA源，也就是一些第三方软件的源
PPA源需要KEY，收集了一点：
gpg --keyserver wwwkeys.pgp.net --recv BF810CD5
gpg --export --armor BF810CD5 | sudo apt-key add -
gpg --keyserver wwwkeys.pgp.net --recv DA6DEEAA
gpg --export --armor DA6DEEAA | sudo apt-key add -
gpg --keyserver wwwkeys.pgp.net --recv 4E5E17B5
gpg --export --armor 4E5E17B5 | sudo apt-key add -
gpg --keyserver wwwkeys.pgp.net --recv 0C713DA6
gpg --export --armor 0C713DA6 | sudo apt-key add -
gpg --keyserver wwwkeys.pgp.net --recv 42C24D89
gpg --export --armor 42C24D89 | sudo apt-key add -
gpg --keyserver wwwkeys.pgp.net --recv 77558DD0
gpg --export --armor 77558DD0 | sudo apt-key add -
gpg --keyserver wwwkeys.pgp.net --recv009ED615
gpg --export --armor 009ED615 | sudo apt-key add -
gpg --keyserver wwwkeys.pgp.net --recv1D9D38E5
gpg --export --armor 1D9D38E5 | sudo apt-key add -
当然还有些
没有公钥，签名无法进行验证的可以这样解决：
出现的错误信息：
W: GPG error:
http://deb.opera.com etchRelease: 由于没有公钥，下列签名无法进行验证： NO_PUBKEY 033431536A423791
W: 您可能需要运行 apt-get update 来解决这些问题
查了下，只要把对应公钥找回来就行了。。。
比如，上面我提示缺少的key是：NO_PUBKEY 033431536A423791
记住后八位［6A423791］
终端输入命令：
gpg --keyserver wwwkeys.pgp.net --recv 6A423791
此命令是获得从公钥服务器获得公钥
获得公钥后告诉 apt-get
gpg --export --armor 6A423791 | sudo apt-key add -
再sudo apt-get update，返回的错误消失
好了，开始更新吧
备份软件源:
sudo cp /etc/apt/sources.list /etc/apt/sources.list_backup
编辑软件源:
sudo gedit /etc/apt/sources.list
更新软件源:
sudo apt-get update
接着，用命令行也行，用新立德也行，用更新管理器也行
更新完毕，不要着急装更新，先装语言包，装完语言包马上重起，就会变成全中文的了，再打开更新管理器开始更新吧！
