ubuntu reinstall grub code example

Example 1: ubuntu grub repair

sudo apt-add-repository ppa:yannubuntu/boot-repair

sudo apt-get update

sudo apt-get install -y boot-repair

boot-repair

Example 2: install grub manually

# grub-install --target=x86_64-efi --efi-directory=esp --bootloader-id=GRUB

Example 3: install grub manually

# grub-mkconfig -o /boot/grub/grub.cfg