之前對Ubuntu的更新支持，LTS沒有深入理解，一直使用ubuntu 10.10 maverick，資源占用，效率都很滿意。
今天使用sudo apt-get install 無法安裝軟件，錯誤提示如下：
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]
第一反應，是ubuntu支持過期了，但之前理解是“不再提供軟件的官方更新”，但ubuntu 10.10中已發布版本的軟件應該可以用吧。這里是我理解錯誤。
訪問：http://cn.archive.ubuntu.com/ubuntu/dists/ 查看，已經沒有maverick的支持了。又結合http://zh.wikipedia.org/wiki/Ubuntu的長期支持版本部分內容，尤其下圖：
確定問題所在，解決方法：
1. 升級新版本。困難，折騰，贊未考慮。
2. 使用舊版本更新源，但目前已經沒有了maverick相應支持軟件目錄，無法下載軟件。
Google 問題解決：http://ubuntuforums.org/archive/index.php/t-1127305.html，文中指的歷史版本是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解決方案］有效解決此問題，但嘗試了下，國外的服務器速度太慢，幾乎無法忍受。
3. 考慮ubuntu 10.04是LTS版本，且於10.10差距不大，可否使用10.04的源更新安裝軟件。
測試使用10.04 lucid的更新源，軟件安裝成功，暫時使用此方案。
對Linux更新支持方案理解尚未深入，同時選擇系統版本安裝時需考慮長期更新版本，后續升級問題。下一步考慮升級到12.04了。