I'm not sure if this is Ubuntu's problem or a hardware problem but since this morning, my laptop keeps crashing. Always, whenever it happens, any audio which happened to be playing kept going but everything else freezes up. Other times, I can still browse any window that was open before it crashes, but Unity shuts down completely, i.e. no toolbar, flag key doesn't work, Terminal keyboard short-cut doesn't work.
If it helps, I'm using a System 76 laptop, Intel® Core™ i7-2760QM CPU @ 2.40GHz × 8 and 32-bit 12.04 LTS. No graphics card.
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