It looks like this is deliberate. From
https://launchpad.net/ubuntu/+source/fglrx-installer
Published on 2010-02-10
Changelog
fglrx-installer (2:8.660-0ubuntu6) lucid; urgency=low
* debian/control:
- Provide xserver-xorg-video-5 so as to make the package
uninstallable until AMD restores compatibility with X.
-- Alberto Milone <email address hidden> Wed, 10 Feb 2010 10:14:14 -0500
The ATI Catalyst (fglrx) driver does not currently support Xserver 1.7.
If support does not arrive this month Ubuntu 10.04 "Lucid Lynx" may be
released with a special unreleased Catalyst driver to support Xserver
1.7, similar to what occurred in 9.10 "Karmic Koala" and 9.04 "Jaunty
Jackalope".
--
Radeon HD 3200 Graphics non detected by "Hardware Drivers" at startup
https://bugs.launchpad.net/bugs/519053
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