Grub install fails with “grub-install: error: cannot find EFI directory.”

This problem arises if you have converted from MBR to GPT partition and you have installed the OS in NON-UEFI mode so to solve this problem make a new bootable device with GPT and installed it in UEFI mode then the problem will be solved

Apparently fastboot from windows 10 may be blocking the installer from peeking into EFI partition. Disable it from advanced power options. Disable secure boot. Run the installer again.

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