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The choice of grub-install or update-grub is appropriate because these commands are specifically designed for configuring the GRUB bootloader.

grub-install is used to install the GRUB bootloader to a specific drive, making it bootable by writing the necessary files and configuration to the disk. This command is integral when setting up GRUB for the first time or reinstalling it after an operating system change.

update-grub, on the other hand, is a script that generates the GRUB configuration file (grub.cfg) based on the operating systems detected on the machine. It scans the drives for other operating systems and configures the boot entries accordingly. This makes it essential for keeping the bootloader configuration up-to-date, especially when new kernels or operating systems are installed.

In contrast, other options either do not directly configure the GRUB bootloader or serve different purposes. For example, boot-repair is used for repairing boot issues but not specifically for configuring GRUB. grub2-reboot allows setting the next boot entry temporarily, focusing on a one-time boot option rather than configuration changes. bootloader-config is not a standard tool found in typical Linux distributions for configuring GRUB, which makes it less relevant compared to the specified commands.