UEFI

# list entry
efibootmgr -v

#delete entry
efibootmgr -b 0012 -B

grub-install --efi-directory=/mnt/efi

efibootmgr --create --disk /dev/sda --part 1 --label "Ubuntu /dev/sda" --loader \\EFI\\UBUNTU\\GRUBX64.EFI

Links
https://wiki.archlinux.de/title/UEFI_Installation