I have the same problem. I upgrade from 9.10, everything went fine. But after a while between 2-8h (i was downloading something) it locked up. Nothing on the screen, the system doesnt seem to react to any keyboard or mouse input. I have to manually reset to bring it back. Yesterday, it happened again after 1h while waiting to shutdown (sudo shutdown -hP +120) and then even the reset button doesnt bring it back, I have to unplug the power cable and plug it back to restart the machine. I doubt if it's hardware issue since my windows 7 is running just fine.
Any suggestion would be appreciated. BTW, i i'm running 32x kernel with pae.
Thanks in advance
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