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I had to hard reboot my machine and I had a file system corruption. I have tried to run fsck on the partition from live CD. However my partition is ext4 and I understand that fsck defaults to ext2 which happened in my case of an old boot-repair disk. Now my file system is further corrupted.

How to fix this problem and recover my Ubuntu 10.04 back?

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I would recommend that you do not touch the disk any more.

You can however try to recover your files yourself with harddrive forensics analysis tools, just download a backtrack livecd and recover files to a harddrive connected via usb.

Here you can download Backtrack:

If there are important files on the disk, then take it to a professional in recovering harddrives. Your money will be worth it.

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