之前对Ubuntu的更新支持，LTS没有深入理解，一直使用ubuntu 10.10 maverick，资源占用，效率都很满意。
今天使用sudo apt-get install 无法安装软件，错误提示如下：
W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/maverick/main/source/Sources.gz 404 Not Found W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/maverick/restricted/source/Sources.gz 404 Not Found W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/maverick/universe/source/Sources.gz 404 Not Found W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/maverick/multiverse/source/Sources.gz 404 Not Found W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/maverick/main/binary-i386/Packages.gz 404 Not Found W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/maverick/restricted/binary-i386/Packages.gz 404 Not Found W: Failed to fetch http://linux.dropbox.com/ubuntu/dists/maverick/main/binary-i386/Packages.gz Connection failed [IP: 199.47.216.171 80] W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/maverick/universe/binary-i386/Packages.gz 404 Not Found W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/maverick/multiverse/binary-i386/Packages.gz 404 Not Found W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/maverick-updates/main/source/Sources.gz 404 Not Found W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/maverick-updates/restricted/source/Sources.gz 404 Not Found W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/maverick-updates/universe/source/Sources.gz 404 Not Found W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/maverick-updates/multiverse/source/Sources.gz 404 Not Found W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/maverick-updates/main/binary-i386/Packages.gz 404 Not Found W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/maverick-updates/restricted/binary-i386/Packages.gz 404 Not Found W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/maverick-updates/universe/binary-i386/Packages.gz 404 Not Found W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/maverick-updates/multiverse/binary-i386/Packages.gz 404 Not Found W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/maverick-security/main/source/Sources.gz 404 Not Found [IP: 91.189.91.13 80] W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/maverick-security/restricted/source/Sources.gz 404 Not Found [IP: 91.189.91.13 80] W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/maverick-security/universe/source/Sources.gz 404 Not Found [IP: 91.189.91.13 80] W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/maverick-security/multiverse/source/Sources.gz 404 Not Found [IP: 91.189.91.13 80] W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/maverick-security/main/binary-i386/Packages.gz 404 Not Found [IP: 91.189.91.13 80] W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/maverick-security/restricted/binary-i386/Packages.gz 404 Not Found [IP: 91.189.91.13 80] W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/maverick-security/universe/binary-i386/Packages.gz 404 Not Found [IP: 91.189.91.13 80] W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/maverick-security/multiverse/binary-i386/Packages.gz 404 Not Found [IP: 91.189.91.13 80]
第一反应，是ubuntu支持过期了，但之前理解是“不再提供软件的官方更新”，但ubuntu 10.10中已发布版本的软件应该可以用吧。这里是我理解错误。
访问：http://cn.archive.ubuntu.com/ubuntu/dists/ 查看，已经没有maverick的支持了。又结合http://zh.wikipedia.org/wiki/Ubuntu的长期支持版本部分内容，尤其下图：
确定问题所在，解决方法：
1. 升级新版本。困难，折腾，赞未考虑。
2. 使用旧版本更新源，但目前已经没有了maverick相应支持软件目录，无法下载软件。
Google 问题解决：http://ubuntuforums.org/archive/index.php/t-1127305.html，文中指的历史版本是ubuntu 7.04 feisty. 道理相通.
Feisty has expired and no longer support. Therefore, the repos have been moved to http://old-releases.ubuntu.com/. You need to replace the current repos in your /etc/apt/sources.list with the new repos, http://old-releases.ubuntu.com/. deb http://old-releases.ubuntu.com/ubuntu feisty main restricted
［old-release解决方案］有效解决此问题，但尝试了下，国外的服务器速度太慢，几乎无法忍受。
3. 考虑ubuntu 10.04是LTS版本，且于10.10差距不大，可否使用10.04的源更新安装软件。
测试使用10.04 lucid的更新源，软件安装成功，暂时使用此方案。
对Linux更新支持方案理解尚未深入，同时选择系统版本安装时需考虑长期更新版本，后续升级问题。下一步考虑升级到12.04了。