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I'm dual booting Linux and Windows 10. I've had Linux on my Lenovo 130 15ast for a little while. I was just messing around and all the sudden I made a mistake and now I can't get the Windows 10 boot option back in the Grub boot menu. This is what I tried to do from the grub prompt: 

grub> chainloader +1
error: invalid EFI file path
grub> ls (hd0,gpt1)/
efi/
grub> chainloader (hd0),gpt1)/EFI/Microsoft/Boot/bootmgfw.efi boot
error: file `/EFI/Microsoft/Boot/bootmgfw.efi' not found  
grub> _

Then I tried (gtp2 ) grub returned error: unknown filesystem

enter image description here

karel
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osxdos
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    Does this answer your question? [Add Windows 10 to GRUB OS list](https://askubuntu.com/questions/661947/add-windows-10-to-grub-os-list) – karel Jan 12 '20 at 22:20
  • What version Ubuntu? What is "*I was just messing around and all the sudden I made a mistake*"? – heynnema Jan 13 '20 at 16:28

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