grub-set-default

Set the default boot entry for GRUB. More information: https://manned.org/grub-set-default.

Set the default boot entry to an entry number, name or identifier:

sudo grub-set-default entry_number

Set the default boot entry to an entry number, name or identifier for an alternative boot directory:

sudo grub-set-default --boot-directory /path/to/boot_directory entry_number

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