It's dublicate of
https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/402795
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grub2 doesn't find an existing windows installation
https://bugs.launchpad.net/bugs/403520
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ubuntu-bugs
*** This bug is a duplicate of bug 402795 ***
https://bugs.launchpad.net/bugs/402795
** This bug has been marked a duplicate of bug 402795
windows option not shown
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grub2 doesn't find an existing windows installation
https://bugs.launchpad.net/bugs/403520
You received this bug