It is a tool which may work 98% on most default UEFI systems. Since your system seems to be problematic I suggest to maintain grub on your end manually. Arch and Manjaro normally don’t maintain grub at all. So the grub version you install via the install media is the one installed to your UEFI or MBR. Read my post again to get the needed background what we tried to achieve with this script: Install-grub: a new way to keep your EFI/MBR in-sync with grub package
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