I bought an SSD for my laptop and I moved the old one on the optical drive bay. I installed windows on my SSD and then installed ubuntu on the old one (sdb). I installed Ubuntu using manual partitioning and installed grub on the windows hard drive (sda) and now I'm not able to boot windows anymore nor to find it using grub-update.

os-prober gives me only ubuntu:

sudo os-prober /dev/sdb1:Ubuntu 14.04.3 LTS (14.04):Ubuntu:linux

Windows is on sda.

How to fix this?

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  • @DavidFoerster thank for your time but I have the opposite problem and a two hard drives case. – Dario Feb 4 '16 at 12:40
  • It doesn't matter. The solution is the same: to repair the boot loader and its configuration. If it doesn't help, please include a link to the Boot-Repair log in your question as it contains most of the necessary problems to debug your problem. – David Foerster Feb 4 '16 at 12:45

I solved the problem by reinstalling windows 10 MBR on the the first hard drive using a usb drive. The I installed grub on the second hard drive (where Ubuntu is) and I put it as first in the boot order. Grub is now able to recognize the window partition and everything works fine.

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