文章轉自：http://rongjih.blog.163.com/blog/static/33574461201551802140680/
升級成功很有效果
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以下为Ubuntu 11.04的升级记录 (2015-06-18)。
由于11.04早就过了维护期，无法使用常规的升级方法!
》更新前：
$ uname -a
Linux bcserver4utest 2.6.38-8-server #42-Ubuntu SMP Mon Apr 11 03:49:04 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux
》升级步骤记录：（参考：EOLUpgrades）2015-06-18
1）更改更新源
$ sudo cp /etc/apt/sources.list /etc/apt/sources.list.20150617.bak
$ sudo vi /etc/apt/sources.list
将内容改为如下：
deb http://old-releases.ubuntu.com/ubuntu/ natty main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ natty-updates main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ natty-security main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ natty-backports main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ natty-proposed main restricted universe multiverse
执行一下如下更新：
$ sudo apt-get update
$ sudo apt-get dist-upgrade
2）Update-manager
$ sudo aptitude install update-manager-core update-manager
3）更新内核
$ sudo aptitude install linux-image-server linux-headers-server
完成后重启一下 $ sudo reboot，内核更新后版本如下：
$ uname -a
Linux bcserver4utest 2.6.38-16-server #67-Ubuntu SMP Thu Sep 6 18:15:24 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
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