Welcome to the club of Debian (Ubuntu) users that can't install the most recent eZ Components release. Yes, Debian has PHP 5.2 but the stable repository only has 5.2.0 with a couple of debian patches.
I encountered the same issue a couple of weeks ago and a couple of folks were kind enough to point me to Dotdeb [1]. Dotdeb provides packages for Debian stable (PHP is just one of them) so I assume they'll work on Ubuntu as well.
Sorry to bother you. But I don't like installations. I do not want to do anything bad ....
I see in the others sites, a not precise guide...
How do I install eZ Components?
Once I downloaded, how I unpack the tar.bz2.tar of ezComponents 2007.2.1 ? and especially where?
In my case I installed eZ Publish in / var / www / ezpublish / Do I need to decompress the file in folder ezpublish, or /var/www/ ?