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I have a thinkpad T60 installed with Windows 7 and Ubuntu 12.04 without any problem. However, after I upgraded Ubuntu 12.04 to 12.10 (beta2) I found my Windows 7 was missing in the grub menu. I also tried fresh installation for Ubuntu 12.10 beta2 several times (with and without partition but the result was same (It was also very strange that the restart doesn't work). I also noticed that the installer (I burned a live DVD) could not detect Windows 7. Finally I decided to re-install 12.04 and Windows 7 came back again.

Could anybody please tell me what might be the problem?

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closed as off topic by Bruno Pereira Oct 1 '12 at 20:04

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2 Answers

Yes, it's a development release. There are bound to be plenty of problems. Reinstall 12.04 and wait until 12.10 is released properly before upgrading. It sounds like the partition detection is not finding Windows boot partitions properly. Alphas and betas are really off topic for Ask Ubuntu.

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Try typing sudo update-grub in Terminal. You should see a list of all installations in the computer.

If you don't see it's something wrong, you can try sudo grub-install /dev/sdX (sda for example if it's the only disk), and again sudo update-grub. If also this does not help then it may be somethig wrong with Windows partition.

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