Comment 19 for bug 292214

How to install the old xorg distribution:
1. add to /etc/apt/sources.list: deb http://archive.ubuntu.com/ubuntu hardy main restricted universe multiverse
2. sudo aptitude install --without-recommends xserver-xorg=1:7.3+10ubuntu10
I got the version by looking at the output of: aptitude -v show xserver-xorg
3. dpkg screwed up the first time I ran (2) so I had to run it again, reject the first suggestion offered (n), and accept the second (y); this time it worked
4. sudo aptitude hold xserver-xorg

This is just a temporary solution, as you won't receive updates to the hardy version. (Someone who knows about "pinning" can perhaps explain how to set that up.) When you're ready to upgrade again, do: sudo aptitude unhold xserver-xorg