Comment 5 for bug 585647

I had the same problem in lucid. Looks to be a video driver issue though. Tried updating to the xserver-xorg-video-intel driver from the x-updates PPA and after doing this I haven't had any crashes happen on me.

apt-cache policy xserver-xorg-video-intel
xserver-xorg-video-intel:
  Installed: 2:2.11.0-1ubuntu1~xup
  Candidate: 2:2.11.0-1ubuntu1~xup
  Version table:
 *** 2:2.11.0-1ubuntu1~xup 0
        410 http://ppa.launchpad.net/ubuntu-x-swat/x-updates/ubuntu/ lucid/main Packages
        100 /var/lib/dpkg/status
     2:2.9.1-3ubuntu5 0
        500 http://dk.archive.ubuntu.com/ubuntu/ lucid/main Packages