Yes, I know that there is exactly the same question is asked here, but in my case I would like to provide more information in order to try to solve the problem. Because that question had been asked more than a week ago and still doesn't have an answer.
So, I am using a netbook Asus EEE PC 1001 HA, 10" with Ubuntu 11.10 Desktop. The screenshot is given below. This error message has been started to occur occasionally 2 days ago. After showing this error message Ubuntu just stops to respond to any command and I need to shut down the netbook using power button. So, what could be the problem here? Do you think it is a hardware problem or a software problem?
If you need any further information I can provide it without any problem.