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I have a problem with starting Ubuntu 12.04lts in a system which has a Windows 7 beside.
the grub cannot load and we see a massage which announces there is a problem with grub and there is a line like :

grub rescue >

I can load the system with a grub recovery CD,but the loaded grub knows the other OS as a windows vista. how can I fix it and have my two OS without needing CD.

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You can go through the wiki entry below and see whether it fixes the issue.

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Welcome to Ask Ubuntu! 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. – Peachy Oct 27 '12 at 2:21

See this post my answer will work for fixing your problem but You must need Ubuntu Live disc.

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