1.sudo gedit /etc/apt/sources.list 
编辑你的源列表，将原来的内容全部删除，添加下面列表中最适合你的源（注意不要全部添加），选择一个最合适你的即可，复制到你的列表中，然后保存列表。 

2.sudo apt-get update 更新源列表信息 
可以在运行“sudo apt-get update ”时查看一下错误信息，把不能连接的源删除再重新运行“sudo apt-get update ”。 

3.sudo apt-get upgrade 升 级或者用ubuntu自带的更新管理器升级也可 

Ubuntu 10.04源列表： 

网易（速度很快） 

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 

搜狐 

deb http://mirrors.shlug.org/ubuntu/ lucid main universe restricted multiverse 
deb-src http://mirrors.shlug.org/ubuntu/ lucid main universe restricted multiverse 
deb http://mirrors.shlug.org/ubuntu/ lucid-security universe main multiverse restricted 
deb-src http://mirrors.shlug.org/ubuntu/ lucid-security universe main multiverse restricted 
deb http://mirrors.shlug.org/ubuntu/ lucid-updates universe main multiverse restricted 
deb http://mirrors.shlug.org/ubuntu/ lucid-proposed universe main multiverse restricted 
deb-src http://mirrors.shlug.org/ubuntu/ lucid-proposed universe main multiverse restricted 
deb http://mirrors.shlug.org/ubuntu/ lucid-backports universe main multiverse restricted 
deb-src http://mirrors.shlug.org/ubuntu/ lucid-backports universe main multiverse restricted 
deb-src http://mirrors.shlug.org/ubuntu/ lucid-updates universe main multiverse restricted 

SRT Sources 

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 

ubuntu官方上海源 

deb http://mirror.rootguide.org/ubuntu/ lucid main universe restricted multiverse 
deb-src http://mirror.rootguide.org/ubuntu/ lucid main universe restricted multiverse 
deb http://mirror.rootguide.org/ubuntu/ lucid-security universe main multiverse restricted 
deb-src http://mirror.rootguide.org/ubuntu/ lucid-security universe main multiverse restricted 
deb http://mirror.rootguide.org/ubuntu/ lucid-updates universe main multiverse restricted 
deb http://mirror.rootguide.org/ubuntu/ lucid-proposed universe main multiverse restricted 
deb-src http://mirror.rootguide.org/ubuntu/ lucid-proposed universe main multiverse restricted 
deb http://mirror.rootguide.org/ubuntu/ lucid-backports universe main multiverse restricted 
deb-src http://mirror.rootguide.org/ubuntu/ lucid-backports universe main multiverse restricted 
deb-src http://mirror.rootguide.org/ubuntu/ lucid-updates universe main multiverse restricted