#用gedit打开sources.list文件
在接下来在打开的文本编辑器中，把看到的内容全部删掉，在上面Ubuntu11.04源列表里选择一组对于你来说速度最快的更新服务器列表。粘贴到你所看到的窗口中。这里推荐台湾源和网易源，更新软件的速度很快！
4. 关闭文本编辑器。
5. 更新软件包列表。执行下面的命令：
sudo apt-get update
6. 安装系统更新
打开“系统->系统管理->更新管理器”，安装更新。完成后若系统提示重新启动，请重新启动系统。
如果你是校园网用户，请查看：Ubuntu11.04教育网源
下面是Ubuntu 11.04一些常见的源
#Ubuntu官方源
deb cn.archive.Ubuntu.com/ubuntu/ natty multiverse
deb-src cn.archive.Ubuntu.com/ubuntu/ natty multiverse
deb cn.archive.Ubuntu.com/ubuntu/ natty-updates multiverse
deb-src cn.archive.Ubuntu.com/ubuntu/ natty-updates multiverse
deb security.Ubuntu.com/ubuntu natty-security main restricted
deb-src security.Ubuntu.com/ubuntu natty-security main restricted
deb security.Ubuntu.com/ubuntu natty-security universe
deb-src security.Ubuntu.com/ubuntu natty-security universe
deb security.Ubuntu.com/ubuntu natty-security multiverse
deb-src security.Ubuntu.com/ubuntu natty-security multiverse
deb archive.canonical.com/Ubuntu natty partner
deb-src archive.canonical.com/Ubuntu natty partner
#Ubuntu 11.04台湾源（推荐）
deb tw.archive.Ubuntu.com/ubuntu/ natty main universe restricted multiverse
deb-src tw.archive.Ubuntu.com/ubuntu/ natty main universe restricted multiverse
deb tw.archive.Ubuntu.com/ubuntu/ natty-security universe main multiverse restricted
deb-src tw.archive.Ubuntu.com/ubuntu/ natty-security universe main multiverse restricted
deb tw.archive.Ubuntu.com/ubuntu/ natty-updates universe main multiverse restricted
deb-src tw.archive.Ubuntu.com/ubuntu/ natty-updates universe main multiverse restricted
#SRT Sources
deb Ubuntu.srt.cn/ubuntu/ natty main restricted universe multiverse
deb Ubuntu.srt.cn/ubuntu/ natty-security main restricted universe multiverse
deb Ubuntu.srt.cn/ubuntu/ natty-updates main restricted universe multiverse
deb Ubuntu.srt.cn/ubuntu/ natty-proposed main restricted universe multiverse
deb Ubuntu.srt.cn/ubuntu/ natty-backports main restricted universe multiverse
deb-src Ubuntu.srt.cn/ubuntu/ natty main restricted universe multiverse
deb-src Ubuntu.srt.cn/ubuntu/ natty-security main restricted universe multiverse
deb-src Ubuntu.srt.cn/ubuntu/ natty-updates main restricted universe multiverse
deb-src Ubuntu.srt.cn/ubuntu/ natty-proposed main restricted universe multiverse
deb-src Ubuntu.srt.cn/ubuntu/ natty-backports main restricted universe multiverse
#Ubuntu11.04网易源（速度很快、推荐）
deb mirrors.163.com/Ubuntu/ natty main universe restricted multiverse
deb-src mirrors.163.com/Ubuntu/ natty main universe restricted multiverse
deb mirrors.163.com/Ubuntu/ natty-security universe main multiverse restricted
deb-src mirrors.163.com/Ubuntu/ natty-security universe main multiverse restricted
deb mirrors.163.com/Ubuntu/ natty-updates universe main multiverse restricted
deb mirrors.163.com/Ubuntu/ natty-proposed universe main multiverse restricted
deb-src mirrors.163.com/Ubuntu/ natty-proposed universe main multiverse restricted
deb mirrors.163.com/Ubuntu/ natty-backports universe main multiverse restricted
deb-src mirrors.163.com/Ubuntu/ natty-backports universe main multiverse restricted
deb-src mirrors.163.com/Ubuntu/ natty-updates universe main multiverse restricted
#Ubuntu11.04上海源
deb mirror.rootguide.org/Ubuntu/ natty main universe restricted multiverse
deb-src mirror.rootguide.org/Ubuntu/ natty main universe restricted multiverse
deb mirror.rootguide.org/Ubuntu/ natty-security universe main multiverse restricted
deb-src mirror.rootguide.org/Ubuntu/ natty-security universe main multiverse restricted
deb mirror.rootguide.org/Ubuntu/ natty-updates universe main multiverse restricted
deb mirror.rootguide.org/Ubuntu/ natty-proposed universe main multiverse restricted
deb-src mirror.rootguide.org/Ubuntu/ natty-proposed universe main multiverse restricted
deb mirror.rootguide.org/Ubuntu/ natty-backports universe main multiverse restricted
deb-src mirror.rootguide.org/Ubuntu/ natty-backports universe main multiverse restricted
deb-src mirror.rootguide.org/Ubuntu/ natty-updates universe main multiverse restricted
#Ubuntu 11.04 搜狐源
deb mirrors.shlug.org/Ubuntu/ natty main universe restricted multiverse
deb-src mirrors.shlug.org/Ubuntu/ natty main universe restricted multiverse
deb mirrors.shlug.org/Ubuntu/ natty-security universe main multiverse restricted
deb-src mirrors.shlug.org/Ubuntu/ natty-security universe main multiverse restricted
deb mirrors.shlug.org/Ubuntu/ natty-updates universe main multiverse restricted
deb mirrors.shlug.org/Ubuntu/ natty-proposed universe main multiverse restricted
deb-src mirrors.shlug.org/Ubuntu/ natty-proposed universe main multiverse restricted
deb mirrors.shlug.org/Ubuntu/ natty-backports universe main multiverse restricted
deb-src mirrors.shlug.org/Ubuntu/ natty-backports universe main multiverse restricted
deb-src mirrors.shlug.org/Ubuntu/ natty-updates universe main multiverse restricted
#Ubuntu 11.04 骨头源 （bones7456架设的一个Ubuntu源 ，提供ubuntu,deepin）
deb Ubuntu.srt.cn/ubuntu/ natty main universe restricted multiverse
