Used to edit the efi boot records

• sudo efibootmgr -v: list the boot records
• sudo efibootmgr -o new_list_of_boot_numbers: used to edit efi boot order
• sudo efibootmgr -b <bootnum> -B: delete a boot number (-b option specify the boot number. -B option delete that boot number.)
• sudo efibootmgr -b <bootnum> -a: make boot number active
• sudo efibootmgr -b <bootnum> -A: make boot number inactive
• sudo efibootmgr -c -d /dev/sda -p 1 -L "Linux Boot Manager" -l "\EFI\Boot\BOOTX64.EFI":
  • -c: create new entry
  • -d: disk (here /dev/sda)
  • -p: part (partition number on which the EFI System Partition is hosted)
  • -L: Label
  • -l: Loader name (where the boot menu resides, path of the EFI image to boot)

References:

1. Efibootmgr - Gentoo Wiki
2. efibootmgr(8): change EFI Boot Manager - Linux man page