[ubuntu] boot error: kernel bug + invalid opcode @ CPU1

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http://ubuntuforums.org – Hello everyone. Sorry if this thread is not in the right place. I have a dual boot ACER laptop with Ubuntu 11.10 and W7. The graphics card is an ati mobility radeon. Some times, only when i choose ubuntu to load in the grub, after 2 or 3 seconds i get this error: I reset the system and all is well. I boot into Ubuntu just fine. Has anyone faced something like it? (Hardware)