安装Ubuntu软件，选择更新源很重要。要下KUbuntu，体验一下KDE桌面，用Ubuntu10.04 Release中的更新源，几乎用了一个下午，还剩半个小时，实在是受不了了。
找国内的站点，找到国内镜像之后，官方站点还需要30分钟的下载，用163的代理，分分钟的事情！ft，我浪费的时间啊！
网上找到很多，我试过当前可用的有：
#163 Source（熟读奇快！）
- deb http://mirrors.163.com/ubuntu/ lucid main universe restricted multiverse
- deb-src http://mirrors.163.com/ubuntu/ lucid main universe restricted multiverse
- deb http://mirrors.163.com/ubuntu/ lucid-security universe main multiverse restricted
- deb-src http://mirrors.163.com/ubuntu/ lucid-security universe main multiverse restricted
- deb http://mirrors.163.com/ubuntu/ lucid-updates universe main multiverse restricted
- deb http://mirrors.163.com/ubuntu/ lucid-proposed universe main multiverse restricted
- deb-src http://mirrors.163.com/ubuntu/ lucid-proposed universe main multiverse restricted
- deb http://mirrors.163.com/ubuntu/ lucid-backports universe main multiverse restricted
- deb-src http://mirrors.163.com/ubuntu/ lucid-backports universe main multiverse restricted
- deb-src http://mirrors.163.com/ubuntu/ lucid-updates universe main multiverse restricted
#SRT Source
- deb http://ubuntu.srt.cn/ubuntu/ lucid main restricted universe multiverse
- deb http://ubuntu.srt.cn/ubuntu/ lucid-security main restricted universe multiverse
- deb http://ubuntu.srt.cn/ubuntu/ lucid-updates main restricted universe multiverse
- deb http://ubuntu.srt.cn/ubuntu/ lucid-proposed main restricted universe multiverse
- deb http://ubuntu.srt.cn/ubuntu/ lucid-backports main restricted universe multiverse
- deb-src http://ubuntu.srt.cn/ubuntu/ lucid main restricted universe multiverse
- deb-src http://ubuntu.srt.cn/ubuntu/ lucid-security main restricted universe multiverse
- deb-src http://ubuntu.srt.cn/ubuntu/ lucid-updates main restricted universe multiverse
- deb-src http://ubuntu.srt.cn/ubuntu/ lucid-proposed main restricted universe multiverse
- deb-src http://ubuntu.srt.cn/ubuntu/ lucid-backports main restricted universe multiverse
#cn99开源镜像站
- deb http://Ubuntu.cn99.com/ubuntu/ lucid main universe restricted multiverse
- deb-src http://Ubuntu.cn99.com/ubuntu/ lucid main universe restricted multiverse
- deb http://Ubuntu.cn99.com/ubuntu/ lucid-security universe main multiverse restricted
- deb-src http://Ubuntu.cn99.com/ubuntu/ lucid-security universe main multiverse restricted
- deb http://Ubuntu.cn99.com/ubuntu/ lucid-updates universe main multiverse restricted
- deb http://Ubuntu.cn99.com/ubuntu/ lucid-proposed universe main multiverse restricted
- deb-src http://Ubuntu.cn99.com/ubuntu/ lucid-proposed universe main multiverse restricted
- deb http://Ubuntu.cn99.com/ubuntu/ lucid-backports universe main multiverse restricted
- deb-src http://Ubuntu.cn99.com/ubuntu/ lucid-backports universe main multiverse restricted
- deb-src http://Ubuntu.cn99.com/ubuntu/ lucid-updates universe main multiverse restricted
执行下面指令更新你的更新源：
$ sudo gedit /etc/apt/sources.list
把上面列表加到前面，然后执行：
$ sudo apt-get update
有连接不上的站点会报错，直接从列表中移除，再执行sudo apt-get update即可。
后面无论用apt-get install或用Package Manager安装软件，那下载是神速！