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I am using ubuntu 13.04 on my HP-Probook core i-3 laptop from 7 days earlier. There was 6 partitions. One for ubuntu 13.04(Ex-4), others are in NTFS. Today suddenly it hang-upped. After restarting it showed that, there is no OS. So am trying to reinstall Ubuntu 13.04 by a bootable pendrive. At first I select a option to try ubuntu without installing. Then from desktop to install Ubuntu 13.04 it said:

"The installer has detected that the following disks have mounted partitions

Do you want the installer to try to unmount the partitions on these disks before continuing? If you leave them mounted, you will not be able to create, delete, or resize partitions on these disks, but you may be able to install to existing partitions there"

I click to YES. And it continued. Then I select a option that was:

"Erase ubuntu 13.04 and reinstall

warning: This will delete all your Ubuntu 13.04 programs, documents, photos, musics and any other files"

I thought it will delete only the drive where was Ubuntu system file. And click to install. After few secods it wants to write user details. So I didn't missed this step also. After filled up and continued to the next and its working. In that time I felt that its not wanted to select drive, so it was again taken mistake which was held in 2 years ego with ubuntu 10.10, where my harddisk fully formatted and I lost all data.

Instantly I eject the pendrive and restart the Laptop. Again try ubuntu without installing But I found that 500 GB harddisk are in 498 GB file system with no partition and some installation files were copied there.Now I totally turn off the laptop

There was very iumportant data of my 4 year study related. But I don’t want to loss those. Now what can I do………….???

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1  
First of all remember in the future to always keep a backup of your important data, I prefer Dropbox. You might have a go using Parted Magic, you should be able to create a live CD or USB using your pendrive Ubuntu (if you don't have another computer). From it you might try partition rescue. Good luck. –  DrA7 Jul 7 '13 at 14:34
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First of all, stop using your hard disk now! If you want to use your computer, just use "Try Ubuntu" from a bootable pendrive. It isn't really easy to give you a step by step procedure here, so you need to do some reading. There are different tools, but testdisk would be your best bet. Visit this to know more. Also, check the answers under this question, and this question (and this video from the second question). –  Alaa Jul 7 '13 at 14:44
    
I would +1 that, testdisk is an amazing tool. –  searchfgold6789 Jul 7 '13 at 14:49
    
I am trying.......... –  Md. Kamruzzaman Jul 7 '13 at 17:23
    
only one partition is recovered that was primary. One is overwritten and other 3 partitions was logical. Thats why not recovered........ –  Md. Kamruzzaman Jul 9 '13 at 17:08
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