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This is on a Lenovo Thinkpad 13. It dual-boots Windows 10 and Elementary OS with the grub boot manager. It's UEFI.

Upon booting, I received the "error: unknown filesystem" message

Commands:

grub rescue> set prefix=(hd0,5)/boot/grub/  
grub rescue> insmod linux  
error: symbol 'grub_efi_secure_boot' not found.

Alternatively, when I was trying a different approach:

grub rescue> set root=(hd0,5)  
grub rescue> set prefix=(hd0,5)/boot/grub  
grub rescue> insmod normal  
grub rescue> normal

However, when selecting Elementary OS, I was met with:

error: symbol 'grub_efi_secure_boot' not found.

I'm pretty sure that (hd0,5) is the correct one, though, as it does not give the unknown file system error and the .mod files are there.

Additional/Full context, including potentially useful/crucial bits of info:

I had initially set up this laptop to dual boot Windows 10 and Arch Linux.
Due to some issues with grub not appearing, I had entered bcdedit /set {bootmgr} path \EFI\arch\grubx64.efi into the Windows administrative command prompt to make this work.
Eventually, I decided that Arch wasn't right for me and switched to Elementary OS.
I deleted the Arch partitions through Windows, and then installed Elementary OS. I then successfully booted into Elementary and installed some software.
Afterwards, I booted into Windows to do some minor things such as set wallpaper and the like.
After rebooting the computer, I was met with grub rescue, and the above situation has occurred.

Edit: Secure boot is disabled

  • Is secure boot disabled? – defalt Jul 4 '17 at 8:10
  • Yeah, it's disabled – J. Del Val Jul 5 '17 at 5:28

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