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As of Mint 18.3 the default is The [[Grub2 Bootloader]] or specifically grub-install (GRUB) 2.02~beta2-36ubuntu3.14+linuxmint1We installed Mint 19.2 first, and Mint 18.3 second. This caused the Mint 18.3 configuration to be the dominate configuration for the grub bootloader. Therefore, if we wish to change our grub2 settings we must boot to the Mint 18.3 operating system as making changes to the other would not take effect.