经实践证明，用终端中输入命令：sudo update-manager -cd 的方法虽然可行，但是速度是特慢的。
还可以在原来8.10的sources.list文件中直接加上9.04的源，再sudo apt-get update 更新源之后，再运行更新管理器即可发现9.04的安装包，安装即可。

加入Ubuntu 9.04(Jaunty Jackalope)源直接升级就可以：

一.换源
sudo gedit /etc/apt/sources.list
或sudo vim /etc/apt/sources.list
选择以下合适的源覆盖进去并保存退出.
＃＃欧洲官方源
deb http://archive.ubuntu.com/ubuntu/ jaunty main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ jaunty-security main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ jaunty-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ jaunty-proposed main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ jaunty main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ jaunty-security main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ jaunty-proposed main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ jaunty-backports main restricted universe multiverse

二.更新
sudo apt-get update
sudo apt-get upgrade
升级包大概几十兆,升完级后,用任务管理器看一下,已经是9.04了。

三.容易出现的问题
重启后系统可能起不来，是因为多了个配置文件，进到安全模式把它删掉就行了
sudo rm /etc/X11/Xsession.d/*pulseaudio
进入系统 后，可能没声音，打开音量控制面板，把静音的地方的对号都点掉即可

其他更新源
# 国内电信源，速度很少低于 100k
deb http://mirror.lupaworld.com/ubuntu/archive/ jaunty main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu/archive/ jaunty-updates main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu/archive/ jaunty-backports main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu/archive/ jaunty-security main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu/archive/ jaunty-proposed main multiverse restricted universe
deb-src http://mirror.lupaworld.com/ubuntu/archive/ jaunty main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu/archive/ jaunty-updates main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu/archive/ jaunty-backports main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu/archive/ jaunty-security main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu/archive/ jaunty-proposed main restricted universe multiverse
#传说中的中国科技大学 5M/s
deb http://debian.ustc.edu.cn/ubuntu/ jaunty main restricted universe multiverse
deb http://debian.ustc.edu.cn/ubuntu/ jaunty-backports restricted universe multiverse
deb http://debian.ustc.edu.cn/ubuntu/ jaunty-proposed main restricted universe multiverse
deb http://debian.ustc.edu.cn/ubuntu/ jaunty-security main restricted universe multiverse
deb http://debian.ustc.edu.cn/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src http://debian.ustc.edu.cn/ubuntu/ jaunty main restricted universe multiverse
deb-src http://debian.ustc.edu.cn/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src http://debian.ustc.edu.cn/ubuntu/ jaunty-proposed main restricted universe multiverse
deb-src http://debian.ustc.edu.cn/ubuntu/ jaunty-security main restricted universe multiverse
deb-src http://debian.ustc.edu.cn/ubuntu/ jaunty-updates main restricted universe multiverse
#传说中的北京交大 速度 2M/s
deb http://mirror.bjtu.edu.cn/ubuntu/ jaunty main restricted universe multiverse
deb http://mirror.bjtu.edu.cn/ubuntu/ jaunty-backports restricted universe multiverse
deb http://mirror.bjtu.edu.cn/ubuntu/ jaunty-proposed main restricted universe multiverse
deb http://mirror.bjtu.edu.cn/ubuntu/ jaunty-security main restricted universe multiverse
deb http://mirror.bjtu.edu.cn/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src http://mirror.bjtu.edu.cn/ubuntu/ jaunty main restricted universe multiverse
deb-src http://mirror.bjtu.edu.cn/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src http://mirror.bjtu.edu.cn/ubuntu/ jaunty-proposed main restricted universe multiverse
deb-src http://mirror.bjtu.edu.cn/ubuntu/ jaunty-security main restricted universe multiverse
deb-src http://mirror.bjtu.edu.cn/ubuntu/ jaunty-updates main restricted universe multiverse
#传说中的上海交通大学，最热门的源之一
deb http://ftp.sjtu.edu.cn/ubuntu/ jaunty main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ jaunty-backports main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ jaunty-proposed main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ jaunty-security main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ jaunty-updates main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu-cn/ jaunty main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ jaunty main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ jaunty-backports main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ jaunty-proposed main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ jaunty-security main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ jaunty-updates main multiverse restricted universe
#传说中的清华大学ubuntu源 300k/s
deb ftp://ftp3.tsinghua.edu.cn/mirror/ubuntu/ubuntu/ jaunty main restricted universe multiverse
deb ftp://ftp3.tsinghua.edu.cn/mirror/ubuntu/ubuntu/ jaunty-backports restricted universe multiverse
deb ftp://ftp3.tsinghua.edu.cn/mirror/ubuntu/ubuntu/ jaunty-proposed main restricted universe multiverse
deb ftp://ftp3.tsinghua.edu.cn/mirror/ubuntu/ubuntu/ jaunty-security main restricted universe multiverse
deb ftp://ftp3.tsinghua.edu.cn/mirror/ubuntu/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src ftp://ftp3.tsinghua.edu.cn/mirror/ubuntu/ubuntu/ jaunty main restricted universe multiverse
deb-src ftp://ftp3.tsinghua.edu.cn/mirror/ubuntu/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src ftp://ftp3.tsinghua.edu.cn/mirror/ubuntu/ubuntu/ jaunty-proposed main restricted universe multiverse
deb-src ftp://ftp3.tsinghua.edu.cn/mirror/ubuntu/ubuntu/ jaunty-security main restricted universe multiverse
deb-src ftp://ftp3.tsinghua.edu.cn/mirror/ubuntu/ubuntu/ jaunty-updates main restricted universe multiverse
#传说中的兰州大学 260k/s
deb ftp://mirror.lzu.edu.cn/ubuntu/ jaunty main restricted universe multiverse
deb ftp://mirror.lzu.edu.cn/ubuntu/ jaunty-backports restricted universe multiverse
deb ftp://mirror.lzu.edu.cn/ubuntu/ jaunty-proposed main restricted universe multiverse
deb ftp://mirror.lzu.edu.cn/ubuntu/ jaunty-security main restricted universe multiverse
deb ftp://mirror.lzu.edu.cn/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src ftp://mirror.lzu.edu.cn/ubuntu/ jaunty main restricted universe multiverse
deb-src ftp://mirror.lzu.edu.cn/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src ftp://mirror.lzu.edu.cn/ubuntu/ jaunty-proposed main restricted universe multiverse
deb-src ftp://mirror.lzu.edu.cn/ubuntu/ jaunty-security main restricted universe multiverse
deb-src ftp://mirror.lzu.edu.cn/ubuntu/ jaunty-updates main restricted universe multiverse
#传说中的台湾大学 中国电信adsl 150k/s
deb http://ubuntu.csie.ntu.edu.tw/ubuntu/ jaunty main restricted universe multiverse
deb http://ubuntu.csie.ntu.edu.tw/ubuntu/ jaunty-backports restricted universe multiverse
deb http://ubuntu.csie.ntu.edu.tw/ubuntu/ jaunty-proposed main restricted universe multiverse
deb http://ubuntu.csie.ntu.edu.tw/ubuntu/ jaunty-security main restricted universe multiverse
deb http://ubuntu.csie.ntu.edu.tw/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ jaunty main restricted universe multiverse
deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ jaunty-proposed main restricted universe multiverse
deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ jaunty-security main restricted universe multiverse
deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ jaunty-updates main restricted universe multiverse
#传说中的电子科大
deb http://ubuntu.uestc.edu.cn/ubuntu jaunty main restricted universe multiverse
deb http://ubuntu.uestc.edu.cn/ubuntu jaunty-backports main restricted universe multiverse
deb http://ubuntu.uestc.edu.cn/ubuntu jaunty-proposed main restricted universe multiverse
deb http://ubuntu.uestc.edu.cn/ubuntu jaunty-security main restricted universe multiverse
deb http://ubuntu.uestc.edu.cn/ubuntu jaunty-updates main restricted universe multiverse
deb-src http://ubuntu.uestc.edu.cn/ubuntu jaunty main restricted universe multiverse
deb-src http://ubuntu.uestc.edu.cn/ubuntu jaunty-backports main restricted universe multiverse
deb-src http://ubuntu.uestc.edu.cn/ubuntu jaunty-proposed main restricted universe multiverse
deb-src http://ubuntu.uestc.edu.cn/ubuntu jaunty-security main restricted universe multiverse
deb-src http://ubuntu.uestc.edu.cn/ubuntu jaunty-updates main restricted universe multiverse
deb http://ubuntu.uestc.edu.cn/ubuntu-cn jaunty main restricted universe multiverse
deb http://ubuntu.uestc.edu.cn/ubuntustudio jaunty main
#传说中的清华，,但不是清华大学的官方域名
deb http://mirror9.net9.org/ubuntu/ jaunty main multiverse restricted universe
deb http://mirror9.net9.org/ubuntu/ jaunty-backports main multiverse restricted universe
deb http://mirror9.net9.org/ubuntu/ jaunty-proposed main multiverse restricted universe
deb http://mirror9.net9.org/ubuntu/ jaunty-security main multiverse restricted universe
deb http://mirror9.net9.org/ubuntu/ jaunty-updates main multiverse restricted universe
deb-src http://mirror9.net9.org/ubuntu/ jaunty main multiverse restricted universe
deb-src http://mirror9.net9.org/ubuntu/ jaunty-backports main multiverse restricted universe
deb-src http://mirror9.net9.org/ubuntu/ jaunty-proposed main multiverse restricted universe
deb-src http://mirror9.net9.org/ubuntu/ jaunty-security main multiverse restricted universe
deb-src http://mirror9.net9.org/ubuntu/ jaunty-updates main multiverse restricted universe
deb http://mirror9.net9.org/ubuntu-cn/ jaunty main multiverse restricted universe
#传说中的电子科大,但不是uestc的官方域名
deb http://ubuntu.dormforce.net/ubuntu jaunty main restricted universe multiverse
deb http://ubuntu.dormforce.net/ubuntu jaunty-backports main restricted universe multiverse
deb http://ubuntu.dormforce.net/ubuntu jaunty-proposed main restricted universe multiverse
deb http://ubuntu.dormforce.net/ubuntu jaunty-security main restricted universe multiverse
deb http://ubuntu.dormforce.net/ubuntu jaunty-updates main restricted universe multiverse
deb-src http://ubuntu.dormforce.net/ubuntu jaunty main restricted universe multiverse
deb-src http://ubuntu.dormforce.net/ubuntu jaunty-backports main restricted universe multiverse
deb-src http://ubuntu.dormforce.net/ubuntu jaunty-proposed main restricted universe multiverse
deb-src http://ubuntu.dormforce.net/ubuntu jaunty-security main restricted universe multiverse
deb-src http://ubuntu.dormforce.net/ubuntu jaunty-updates main restricted universe multiverse
#传说中的东北大学更新服务器：
deb ftp://ftp.neu.edu.cn/mirror/archive.ubuntu.com/ubuntu/ jaunty main multiverse restricted universe
deb ftp://ftp.neu.edu.cn/mirror/archive.ubuntu.com/ubuntu/ jaunty-backports main multiverse restricted universe
deb ftp://ftp.neu.edu.cn/mirror/archive.ubuntu.com/ubuntu/ jaunty-proposed main multiverse restricted universe
deb ftp://ftp.neu.edu.cn/mirror/archive.ubuntu.com/ubuntu/ jaunty-security main multiverse restricted universe
deb ftp://ftp.neu.edu.cn/mirror/archive.ubuntu.com/ubuntu/ jaunty-updates main multiverse restricted universe
deb-src ftp://ftp.neu.edu.cn/mirror/archive.ubuntu.com/ubuntu/ jaunty main multiverse restricted universe
deb-src ftp://ftp.neu.edu.cn/mirror/archive.ubuntu.com/ubuntu/ jaunty-backports main multiverse restricted universe
deb-src ftp://ftp.neu.edu.cn/mirror/archive.ubuntu.com/ubuntu/ jaunty-proposed main multiverse restricted universe
deb-src ftp://ftp.neu.edu.cn/mirror/archive.ubuntu.com/ubuntu/ jaunty-security main multiverse restricted universe
deb-src ftp://ftp.neu.edu.cn/mirror/archive.ubuntu.com/ubuntu/ jaunty-updates main multiverse restricted universe
#传说中的厦门大学
deb ftp://ubuntu.realss.cn/ubuntu/ jaunty main restricted universe multiverse
deb ftp://ubuntu.realss.cn/ubuntu/ jaunty-backports restricted universe multiverse
deb ftp://ubuntu.realss.cn/ubuntu/ jaunty-proposed main restricted universe multiverse
deb ftp://ubuntu.realss.cn/ubuntu/ jaunty-security main restricted universe multiverse
deb ftp://ubuntu.realss.cn/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src ftp://ubuntu.realss.cn/ubuntu/ jaunty main restricted universe multiverse
deb-src ftp://ubuntu.realss.cn/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src ftp://ubuntu.realss.cn/ubuntu/ jaunty-proposed main restricted universe multiverse
deb-src ftp://ubuntu.realss.cn/ubuntu/ jaunty-security main restricted universe multiverse
deb-src ftp://ubuntu.realss.cn/ubuntu/ jaunty-updates main restricted universe multiverse
#传说中的西南财经大学
deb http://ftp.swufe.edu.cn/mirror/ubuntu/ jaunty main restricted universe multiverse
deb http://ftp.swufe.edu.cn/mirror/ubuntu/ jaunty-backports restricted universe multiverse
deb http://ftp.swufe.edu.cn/mirror/ubuntu/ jaunty-proposed main restricted universe multiverse
deb http://ftp.swufe.edu.cn/mirror/ubuntu/ jaunty-security main restricted universe multiverse
deb http://ftp.swufe.edu.cn/mirror/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src http://ftp.swufe.edu.cn/mirror/ubuntu/ jaunty main restricted universe multiverse
deb-src http://ftp.swufe.edu.cn/mirror/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src http://ftp.swufe.edu.cn/mirror/ubuntu/ jaunty-proposed main restricted universe multiverse
deb-src http://ftp.swufe.edu.cn/mirror/ubuntu/ jaunty-security main restricted universe multiverse
deb-src http://ftp.swufe.edu.cn/mirror/ubuntu/ jaunty-updates main restricted universe multiverse