ubuntu5.3降级安装5.2

因为要用到Zend Optimizer，但Zend Optimizer v3.3.9并不支持php5.3，特别是在国内一些程序开发商，一直使用旧的平台，新的zend guard与Zend Optimizer并不兼容，所以近切的需要将php5.3降级为5.2
因为这个问题，我折腾了整整一天，按照网上的教程，使用karmic源（UBUNTU 9.10),一直没有成功。一直安装的都是PHP5.3.3
后终于找到原因：ubuntu 9.10的支持日期已经过了，网络上面的karmic源全是错误的，正常的源karmic.list应该是：

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1. # deb cdrom:[Ubuntu 10.04 LTS _Lucid Lynx_ - Release amd64 (20100429)]/ karmic main restricted
2. # See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
3. # newer versions of the distribution.
4. deb http://old-releases.ubuntu.com/ubuntu/ karmic main restricted
5. deb-src http://old-releases.ubuntu.com/ubuntu/ karmic main restricted
6. ## Major bug fix updates produced after the final release of the
7. ## distribution.
8. deb http://old-releases.ubuntu.com/ubuntu/ karmic-updates main restricted
9. deb-src http://old-releases.ubuntu.com/ubuntu/ karmic-updates main restricted
10. ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
11. ## team. Also, please note that software in universe WILL NOT receive any
12. ## review or updates from the Ubuntu security team.
13. deb http://old-releases.ubuntu.com/ubuntu/ karmic universe
14. deb-src http://old-releases.ubuntu.com/ubuntu/ karmic universe
15. deb http://old-releases.ubuntu.com/ubuntu/ karmic-updates universe
16. deb-src http://old-releases.ubuntu.com/ubuntu/ karmic-updates universe
17. ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
18. ## team, and may not be under a free licence. Please satisfy yourself as to
19. ## your rights to use the software. Also, please note that software in
20. ## multiverse WILL NOT receive any review or updates from the Ubuntu
21. ## security team.
22. deb http://old-releases.ubuntu.com/ubuntu/ karmic multiverse
23. deb-src http://old-releases.ubuntu.com/ubuntu/ karmic multiverse
24. deb http://old-releases.ubuntu.com/ubuntu/ karmic-updates multiverse
25. deb-src http://old-releases.ubuntu.com/ubuntu/ karmic-updates multiverse
26. ## Uncomment the following two lines to add software from the 'backports'
27. ## repository.
28. ## N.B. software from this repository may not have been tested as
29. ## extensively as that contained in the main release, although it includes
30. ## newer versions of some applications which may provide useful features.
31. ## Also, please note that software in backports WILL NOT receive any review
32. ## or updates from the Ubuntu security team.
33. # deb http://old-releases.ubuntu.com/ubuntu/ karmic-backports main restricted universe multiverse
34. # deb-src http://old-releases.ubuntu.com/ubuntu/ karmic-backports main restricted universe multiverse
35. ## Uncomment the following two lines to add software from Canonical's
36. ## 'partner' repository.
37. ## This software is not part of Ubuntu, but is offered by Canonical and the
38. ## respective vendors as a service to Ubuntu users.
39. # deb http://archive.canonical.com/ubuntu karmic partner
40. # deb-src http://archive.canonical.com/ubuntu karmic partner
41. deb http://old-releases.ubuntu.com/ubuntu karmic-security main restricted
42. deb-src http://old-releases.ubuntu.com/ubuntu karmic-security main restricted
43. deb http://old-releases.ubuntu.com/ubuntu karmic-security universe
44. deb-src http://old-releases.ubuntu.com/ubuntu karmic-security universe
45. deb http://old-releases.ubuntu.com/ubuntu karmic-security multiverse
46. deb-src http://old-releases.ubuntu.com/ubuntu karmic-security multiverse

1. sudo apt-get update
2. sudo apt-get remove php5 libapache2-mod-php5 php5-xsl php5-gd php-pear php5-mysql php5-curl php5-memcache
3. sudo apt-get install php5 libapache2-mod-php5 php5-xsl php5-gd php-pear php5-mysql php5-curl php5-memcache