Re: [CentOS] Re-enable grub boot in UEFI (Windows took over it)

On Mon, Feb 5, 2018 at 8:27 AM, Kay Diederichs kay.diederichs@uni-konstanz.de wrote:

grub-install /dev/nvme0n1

Running this on computers with UEFI firmware is not good advice, it's an obsolete command. People should use the prebaked grubx64.efi binary that comes in the grub2-efi package, and is a signed binary so it can support UEFI Secure Boot.

If you run grub2-install, a new unsigned grub binary is created, replacing grubx64.efi. If you have Secure Boot enabled, you will not be able to boot, until you either reinstall the grub2-efi package (or you self-sign the grub2-install created binary and then go through the process of informing the firmware this is a valid binary by using mokutil - but I estimate maybe 1 in 50 people might do this).