Install grub2-common by entering the following commands in the terminal:
sudo apt update sudo apt install grub2-common
Description:
GRand Unified Bootloader (common files for version 2)
This package contains common files shared by the distinct flavours of GRUB. The files in this package are specific to GRUB 2, and would break GRUB Legacy if installed on the same system.
Homepage: http://www.gnu.org/software/grub/
Version: 2.02-2ubuntu8
Section: admin