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I have natty and have installed kubuntu-desktop package. Before installing it, everything was fine but after that, this thing happens:

When I'm typing, after stroking a key, screen blacks out, fan speeds up, and I have to turn off machine by pressing power button.

It just happens in many different apps (chromium, hotot, kde proxy settings, ...) and in every environment: Unity, KDE, Gnome 2.

I don't know what details must provide with this question, and I don't like to remove my KDE desktop, or re-install Ubuntu.

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This seems to be a bug. Report it here

Maybe it is because your system isn't powerful enough.

It would be nice if you could post the output of uname -a and your system specifications.

Edit: Maybe the Enter key is set to do something else when it's pressed. See if you can go into System Settings and change that.

Edit: To rebind the Enter key, make a new file called .xmodmaprc That file should go into your Home directly (~). In the file, type pointer = default

Edit: You might also try this: System ➜ Preferences ➜ Keyboard Shortcuts

and see if anything's bound to "Enter"

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i dont think so, since it is a Corei5 powered machine (vaio laptop, vpcs136fg). this is the output: Linux vaio598 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:24 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux. –  sazary Jun 23 '11 at 17:30
Did you report the bug? Has you Enter key been bound to something else? try posting the output to cat ~/.xmodmap –  Joe the Person Jun 23 '11 at 18:16
(That's your keymap) –  Joe the Person Jun 23 '11 at 18:17
yeah, here is that report: bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers/+bug/… that file doesn't exist; i don't know why! –  sazary Jun 24 '11 at 15:07
EDIT: Sorry, I've done it wrong. So, what you want to do is reset the Enter key to it's default value. –  Joe the Person Jun 25 '11 at 4:40
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