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I am having this problem from the time. I have installed Ubuntu 12.04. It is installed inside Windows, I don't know if the problem is related to that.

I am experiencing this sudden freezing/hanging, especially when I am using Firefox. When it freezes no Ctrl + Alt + F1 will work and no Ctrl + SysRq works. This is becoming a very bad problem for me.

Please help me solve this. I believe if I keep on directly restarting the computer, my computer may get damaged any time.

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marked as duplicate by Braiam, dn-ʞɔɐq ɹW, Eric Carvalho, karel, Pilot6 Jan 28 at 20:01

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

    
As a side-note. To reboot Linux the magic works with Alt + SysRq not with Ctrl. Read on here with a Guide to REISUB. – MadMike Oct 14 '13 at 11:32

Are you using VMware or any other software to run Ubuntu inside Windows? If that is the case it is a common problem occurred to everyone who have less configuration Computers. It is recommended to upgrade hardware when running OS in OS.

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I have used Wubi to install it – rhemon19 Oct 14 '13 at 15:11
    
It's okay. What's your system configuration? Add a screenshot here. – MANI Oct 14 '13 at 16:47

Which virtual management software are you running and do you have this option enabled in your bios?

One thing you could do is start firefox from the command line of an open shell like konsole while logging the screen. That way when it crashes you could check out the log and see the error from when it's freezing. It will give you a clue.

But without more information on your configuration it's hard to speculate further.

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I have used Wubi to install it, – rhemon19 Oct 14 '13 at 15:10

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