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Mounting UEFI variables

To use efibootmgr and other software to manipulate the UEFI boot entries the efivars filesystem must be mounted. This isn’t handled automatically as it is a large security concern (see systemd #2402).

Mount efivars

mount -t efivarfs none /sys/firmware/efi/efivars/

Unmount efivars

umount /sys/firmware/efi/efivars/