Confused about re-installation of grub bootloader

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for UEFI ,
if possible

sudo grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=manjaro --recheck --verbose
sudo efibootmgr -v
sudo update-grub

or by chroot

  1. go in chroot ( for mount /boot/efi )
  2. apply
sudo manjaro-chroot -a ( type 1 if only one line 0 appears )
grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=manjaro --recheck --verbose
efibootmgr -v
update-grub
exit ( quit chroot )

see this