Comment 119 for bug 353126

Had the same problem updating to 9.04 (ATI graphics card)

I managed to work-around by following part of this old forum post:
http://ubuntuforums.org/showthread.php?t=470306

That is:
- Install x11vnc and vnc-common:

   sudo apt-get install x11vnc vnc-common

- Disable vino (preferences -> remote desktop)
- Start the vnc server:

sudo /usr/bin/x11vnc -rfbauth /etc/vnc.passwd -noxdamage -forever -bg -o /var/log/x11vnc.log -rfbport 5900

Hope this helps,
Lorenzo