默认的中国源速度非常不错
在终端输入并运行 sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup （备份当前的源列表，以便日後需要时恢复） sudo gedit /etc/apt/sources.list （修改sources.list文件中源的列表）
然后 保存编辑好的文件，终端执行以下命令进行软件升级。 sudo apt-get update #这一步是更新你的源列表，换源後必须执行 （如果更新速度非常慢请更换源 sudo gedit /etc/apt/sources.list ） sudo apt-get upgrade #这一步是更新软件 更新完软件后，再继续设置吧。 有时你可能需要使用:sudo apt-get -f install 来修复安装 因为经常会用到终端：所以把终端加到右键菜单： sudo apt-get install nautilus-open-terminal 这就终端就在右键菜单了可以了！！
# 台湾的官方源速度也相当不错，有时甚至快于内地的： deb http://tw.archive.ubuntu.com/ubuntu lucid main restricted universe multiverse deb http://tw.archive.ubuntu.com/ubuntu lucid-security main restricted universe multiverse deb http://tw.archive.ubuntu.com/ubuntu lucid-updates main restricted universe multiverse deb http://tw.archive.ubuntu.com/ubuntu lucid-backports main restricted universe multiverse deb http://tw.archive.ubuntu.com/ubuntu lucid-proposed main restricted universe multiverse deb-src http://tw.archive.ubuntu.com/ubuntu lucid main restricted universe multiverse deb-src http://tw.archive.ubuntu.com/ubuntu lucid-security main restricted universe multiverse deb-src http://tw.archive.ubuntu.com/ubuntu lucid-updates main restricted universe multiverse deb-src http://tw.archive.ubuntu.com/ubuntu lucid-backports main restricted universe multiverse deb-src http://tw.archive.ubuntu.com/ubuntu lucid-proposed main restricted universe multiverse # 骨头兄亲自搭建并维护这个Ubuntu源（该源位于浙江杭州百兆共享宽带的电信机房)： 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 # Archive.ubuntu.com更新服务器（欧洲，此为官方源，电信网通用户使用)： deb http://archive.ubuntu.com/ubuntu/ lucid main restricted universe multiverse deb http://archive.ubuntu.com/ubuntu/ lucid-security main restricted universe multiverse deb http://archive.ubuntu.com/ubuntu/ lucid-updates main restricted universe multiverse deb http://archive.ubuntu.com/ubuntu/ lucid-proposed main restricted universe multiverse deb http://archive.ubuntu.com/ubuntu/ lucid-backports main restricted universe multiverse deb-src http://archive.ubuntu.com/ubuntu/ lucid main restricted universe multiverse deb-src http://archive.ubuntu.com/ubuntu/ lucid-security main restricted universe multiverse deb-src http://archive.ubuntu.com/ubuntu/ lucid-updates main restricted universe multiverse deb-src http://archive.ubuntu.com/ubuntu/ lucid-proposed main restricted universe multiverse deb http://archive.canonical.com/ lucid partner deb-src http://archive.ubuntu.com/ubuntu/ lucid-backports main restricted universe multiverse
#北京交通大学
deb http://mirror.bjtu.edu.cn/ubuntu/ karmic main multiverse restricted universe
deb http://mirror.bjtu.edu.cn/ubuntu/ karmic-backports main multiverse restricted universe
deb http://mirror.bjtu.edu.cn/ubuntu/ karmic-proposed main multiverse restricted universe
deb http://mirror.bjtu.edu.cn/ubuntu/ karmic-security main multiverse restricted universe
deb http://mirror.bjtu.edu.cn/ubuntu/ karmic-updates main multiverse restricted universe
deb-src http://mirror.bjtu.edu.cn/ubuntu/ karmic main multiverse restricted universe
deb-src http://mirror.bjtu.edu.cn/ubuntu/ karmic-backports main multiverse restricted universe
deb-src http://mirror.bjtu.edu.cn/ubuntu/ karmic-proposed main multiverse restricted universe
deb-src http://mirror.bjtu.edu.cn/ubuntu/ karmic-security main multiverse restricted universe
deb-src http://mirror.bjtu.edu.cn/ubuntu/ karmic-updates main multiverse restricted universe
#江苏双线
deb http://mirror.lupaworld.com/ubuntu karmic main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu karmic-security main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu karmic-updates main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu karmic-backports main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu/ubuntu-cn karmic main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu/ karmic-proposed main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu karmic main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu karmic-security main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu karmic-updates main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu karmic-backports main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu/ karmic-proposed main restricted universe multiverse
