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How to fix "error: unknown filesystem. grub rescue>

I have a laptop with dual boot of windows 7 and ubuntu 12.10.

After installation everything was fine and working properly but after a shutdown and reboot I'm seeing the grub rescue error.

Please help me to fix this. I installed Ubuntu by downloading the software from Canonical and using usb booting!

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marked as duplicate by Web-E, qbi, theDefector, Chris Wilson, LnxSlck Jan 14 '13 at 17:00

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.

Posting the error message you are seeing would help. Did you install/deinstall or change something else before your reboot? – FuzzyQ Jan 14 '13 at 12:07
no i didn't..i dono how it happened also..after i installed and started using i didn't have any problem even when i reinstalled but it started after i shut down the laptop and started it the problem occured. – user123169 Jan 15 '13 at 15:59

1 Answer 1

Boot from a live CD image of Ubuntu Secure Remix and run the Boot-Repair tool. It should identify and correct any problems with your dual-boot setup, I think.

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ok thanx will check this out! – user123169 Jan 14 '13 at 12:19
you don't need ubuntu secure remix, you can add ppa and install boot-repair from live ubuntu cd/usb. – Web-E Jan 14 '13 at 13:20
ok can u please explain me about adding ppa and installing boot repair?? – user123169 Jan 14 '13 at 18:44
sudo add-apt-repository ppa:yannubuntu/boot-repair and then sudo apt-get update && sudo apt-get install boot-repair. That should do it. – João André Jan 14 '13 at 20:53
thank you ver much! tat solved my issue! but i hav got 2 windows 7 loaders during boot now..1 from sda2 n 1 from sda3. both takes me to windows 7 though.. why has tat happened? – user123169 Jan 15 '13 at 17:20