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
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[i965gm] X crash: "i830_uxa_prepare_access: bo map failed"
https://bugs.launchpad.net/bugs/585647
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