Then you would not have to mess with the UEFI nonsense. (Renaming grub圆4.efi will work with Secure Boot disabled, whereas renaming shim圆4.efi will work on most computers with or without Secure Boot.)Īctually, I would wipe the drive clean and re-install Mint in non-UEFI mode (Legacy/CSM), installing the bootloader to the MBR of the external hard drive.
Thus, you need to rename EFI/ubuntu to EFI/BOOT and rename either grub圆4.efi or shim圆4.efi in that directory to boot圆4.efi. To boot on any random computer, you must use the "fallback filename" - EFI/BOOT/boot圆4.efi. If you move the disk to another computer, it will of course have different NVRAM than the original, so that entry won't work.
This filename is not hard-coded on most PCs, though it's stored in NVRAM as part of the installation process. A normal installation of Mint will store GRUB as EFI/ubuntu/grub圆4.efi on the EFI System Partition (ESP).
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