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What should I do when Ubuntu freezes?

I use ubuntu 12.04 64 bits.

I found that sometimes the ubuntu seems not working anymore.

What I can do now is power off by press the power button.

Is there any way to check what happened and solve it?

Thank you~

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marked as duplicate by Takkat, con-f-use, stephenmyall, Tom Brossman, Mik Oct 17 '12 at 22:53

This question was marked as an exact duplicate of an existing question.

Only press the power button when none of the steps outlined here work:… – Takkat Oct 17 '12 at 8:18

I solved the same kind of problem on my HP dm1-4136sf with Ubuntu 12.04 64bits.

Solution was to blacklit the USB-attached Bluetooth device (Broadcom).

$ sudo vim /etc/modprobe.d/blacklist.conf
blacklist btusb

You can try first by unload the module :

$ sudo rmmod btusb

I hope this solve your problem.

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When I try rmmod btusb, it says ERROR: Module btusb is in use. How to solve it? And why we should remove btusb? Thank you – sam Oct 17 '12 at 10:23
Try $ rmmod -f btusb or simpler, add the module to the blacklist as described in my answer and reboot – slc66 Oct 17 '12 at 10:50
If you are not familiar with the text editor Vim, you can use gedit : sudo gedit /etc/modprobe.d/blacklist.conf – slc66 Oct 17 '12 at 10:59
I failed to use -f, so I try to reboot. How to check I disable btusb success or not? Thank you~ – sam Oct 17 '12 at 11:37
And how to get the log of real stuck problem? How you find the solution? Thank you~ – sam Oct 17 '12 at 11:45

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