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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, Stephen Myall, Chris Wilson, LnxSlck Jan 14 '13 at 17:00

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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
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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
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