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If a system administrator wants to update the GRUB2 boot loader on a system that uses BIOS, which command should be used to ensure GRUB2 is properly installed onto the Master Boot Record (MBR)?
grub2-install /dev/sda
grub2-mkconfig -o /boot/grub2/grub.cfg
grub2-update
update-grub
The grub2-install command is used to install the GRUB2 bootloader to the MBR when a system is using BIOS firmware. This command is critical when repairing or reconfiguring the GRUB2 installation. The grub2-mkconfig command generates a new GRUB2 configuration file based on the current system settings, but does not install GRUB to the MBR. There is no such command as grub2-update, and while update-grub is a wrapper script commonly found in Debian-based Linux distributions that calls grub2-mkconfig, it is not the correct command for installing GRUB2 to the MBR.
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