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What should I do when Ubuntu freezes?

I use ubuntu 11.04 64bits. Sometimes ubuntu will get stuck that everything paused including mouse, keyboard, etc.

How can I find out what happened? How to fix it?

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try memtest and harddisk test. Boot ubuntu CD/USB and select the tests from there. –  blade19899 Sep 14 '12 at 8:19
    
Look at these answers: askubuntu.com/q/48029/83046, askubuntu.com/q/4408/83046. –  green7 Sep 14 '12 at 8:21
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marked as duplicate by Marco Ceppi Oct 26 '12 at 19:06

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1 Answer

By "getting stuck" I assume you mean "getting stuck temporarily", the system freezes for a moment, and then the reactivity is back. In my experience, such behavior is caused by extreme high system load, especially IO operations (writing / reading from disk) due to high memory usage and the necessity of using swap.

If this is a thing that happens on a regular basis, I would start monitoring the system load and what programs consume the CPU and memory.

Start by installing indicator-multiload, and let it show not only the cpu, but also memory, load, network. Open a terminal and launch top, which will show list of processes sorted by CPU usage. You can sort it by memory usage by pressing ShiftM.

Alternatively, use gnome-system-monitor.

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