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Windows won't boot after installing Ubuntu from a usb stick. I tried updating grub:

$ sudo update-grub
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.15.0-20-generic
Found initrd image: /boot/initrd.img-4.15.0-20-generic
Found Windows Boot Manager on /dev/sda1@/EFI/Microsoft/Boot/bootmgfw.efi
Adding boot menu entry for EFI firmware configuration
done

It did't help.I checked my partitions and there is a microsoft reserved partition at /dev/sda3 and flags msftres.

I also tried updating grub from startup up window from advanced options under ubuntu header.

While installing i made three separate partitions, and before anything I had my window partition shrunk, as was required.

codedump
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sarp
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  • thank you , it was useful to some degree , i have now windows(uefi) option on boot screen, but it still won't load and goes through diagnosing pc to attempting to repair.....i am trying to repair window boot loader, useful link @karel – sarp May 14 '18 at 07:35
  • How did you get Windows UEFI back on the boot screen? Was it with Rescatux? The reason why I'm asking is that Rescatux has several UEFI options in the boot options section. – karel May 14 '18 at 07:36
  • https://askubuntu.com/a/217970/829598 this helped. I didn't used Rescatux, I still have to make it work though. How do I know if didn't wiped my windows drive() out during installation.@karel – sarp May 14 '18 at 08:03
  • Thanks for telling me which answer helped you so that I could upvote it. The command sudo fdisk -l lists all the partitions. – karel May 14 '18 at 08:13

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Does grub bootloader work fine? If so you can just choose to boot to Windows from grub menu. Otherwise will you please post more information in this?

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  • if you follow previous comment , I have got Windows8(UEFI) option back on grub menu, but it is still not loading...just says attempting repairs, I guess I have to use boot repair disk as suggested on quora http://qr.ae/TUTo9m @AshishKafle – sarp May 14 '18 at 08:08