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What should I do when Ubuntu freezes?

Since I installed Ubuntu 12.04 it keeps on freezing. It happens on different PCs and I don't think it's a memory problem. For example, I recently got a laptoptop with 8Gb of RAM and I got the problem there as well. The only solution is unplugging the machine or pressing +REISUB (I found this magic spell in a related thread).

The problem seems to be triggered by a task switch, e.g. when I press , which moves guake to the background or into the forground or when I press , which switches the current gui task.

I am suspecting guake, chrome, or evince are possible causes of the problem. Having said that, I disabled guake on the laptop and I got the prblem once since then.

I just reinstalled 12.10 and I had 3 freezes in 10 minutes. I wasn't doing anything special. The only thing I was doing was running chrome and gimp.

BTW 12.10 also causes other problems, like not properly showing the menu bar at the top of the window. When I'm running chrome and gimp, the pulldown menus don't show properly. For example, they may have broad diagonal lines with awkward colours such as yellow and blue.

The following is an example of another problem with the file menu:

screen shot

Any help would be greatly appreciated.

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marked as duplicate by Jorge Castro, Stephen Myall, Mitch, Mik, con-f-use Oct 21 '12 at 13:45

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I had a same problem sometimes. there are 20 PC with Ubuntu OS in my office and just 1 of them had this problem randomly. i solve this problem with changing 32 bit to 64 bit. i think it is better to use 64 bit version of Ubuntu with 8GB RAM (on your laptop). I do this and it helps most of the time. also it seems it is graphic card problem. because I had a well PC with Intel On-board Graphic card and it was OK, but when i added a ATI graphic card to it, I had this problem again. i think it is a graphic card driver problem and will be OK by changing Ubuntu from 32 bit to 64 bit or maybe 64 bot to 32 bit. and sometimes by changing Graphic card driver.

also I solve this problem by upgrading kernel to latest stable one, from following link:

http://kernel.ubuntu.com/~kernel-ppa/mainline/

"rc" opens are not stable.

so first: upgrade kernel (for more information you can use this link: http://www.howopensource.com/2012/07/how-to-install-linux-kernel-3-5-quantal-in-ubuntu-12-04-11-10-11-04-10-10-and-10-04/ )

then upgrade graphic card driver manually (from graphic card website)

and last solution: change 32 bit version to 64 bit.

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Thanks for that. I may try this tomorrow:(. Your suggestion makes sent because I definitely get many more freezes on my machine at hoe, which is configured as 32 bit. However, I also got the problem on my desktop at work, which is configured as 64 bit. (Same for laptop.) –  Marc van Dongen Oct 20 '12 at 12:52

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