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My Ubuntu 12.04 is missing Hibernate option so after searching a little on Google I came to know that this can solve my problem

sudo nano /etc/polkit-1/localauthority/50-local.d/com.ubuntu.enable-hibernate.pkla

Fill it with this

[Re-enable hibernate by default]

Here is the link : How to enable hibernation in 12.04?

After doing this I restarted my system. when the system booted it hanged ike anything No mouse movement no terminal no nothing. I waited for more than 1 hour Hibernate option appeared but i was not able to use my system anymore. any ideas ?

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Why did you tag it with playonlinux? – Philippe Aug 1 '12 at 5:31
I didnt found any other suitable tag. – Hussain Nagri Aug 1 '12 at 6:15
Please tag your content suitably. hibernate is a valid tag, as well as power-management, both of which existed well before this post was created. – hexafraction Aug 2 '12 at 12:28
Check this question too. – Anwar Shah Nov 18 '13 at 15:08

In this site are a very good how-to.

Sorry for my bad english, but i speak spanish.

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Now I have a hibernate option in the power tab but it just turns off my system like Shutdown. and when I restart my system it is a fresh new session. No resume of my work. – Hussain Nagri Jul 27 '12 at 8:30
@HussainNagri in this post, there is an instruction to test whether hibernation works on your machine before enabling it. That test is sudo pm-hibernate. Did you run that test to see if hibernate works on your system or not? – Thomas Ward Aug 2 '12 at 13:14
Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. – hexafraction Aug 14 '12 at 17:36

One possible cause of being unable to hibernate is if you encrypted your home directory (and with it your swap partition).

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"Just a thought" is not equal to an answer. – hexafraction Aug 1 '12 at 15:02
Comments are used to "ask authors about clarifications of the post." Please be obsessive with your own comments too. But, to clarify, every answer is the product of a thought. – Philippe Aug 2 '12 at 6:09
Comments are also used to give extra ideas and half-answers. Please revise your answer to actually specify to decrypt the home directory, including all necessary command so that the OP may understand them. – hexafraction Aug 2 '12 at 12:25

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