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Possible Duplicate:
What should I do when Ubuntu freezes?

I am using Ubuntu 12.04, here are my hardware specifications:

Intel® Core™ i5 CPU M 450 @ 2.40GHz × 4, 1.9 GiB, 32 bit, 77.8 GB.

I have several interfaces on my PC such as Unity(default), Gnome-Shell, Gnome2, LXDE, KDE. And I use LightDM.

After logging out from any of these interfaces, it is impossible to login any of them normally without a reboot. The Desktop Interface just freezes after entering the password. I can see the wallpaper, desktop icons, dash and some basic things. None of them respond to the mouse click. (Mouse is all right.) And I have to Ctrl+Alt+F1 to sudo reboot.

Why should I suffer this!?

I found many running compiz processes while it is freezing by top.

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hyiltiz
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  • You're saying that compiz is installed? If it is try to un-install. – Mitch Jun 19 '12 at 17:56
  • You mean I have to unstall compiz? But itn't compiz the default window decorator for Pricise? By the way, I am quite grateful that you answered me. – hyiltiz Jun 22 '12 at 15:00
  • Yes, try it, and see if it helps, you can always install it back. – Mitch Jun 22 '12 at 15:55

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