grub

[liuhangbin]

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Apart from edit /boot/grub2/grub.cfg or /etc/grub2.cfg. We’d better use grubby to config grub.
Here is the example of how to select default grub.
1 2 3 4 5 6 7 8 9 10 11 12 13 # grubby --default-kernel /boot/vmlinuz-4.20.0 # grubby --default-index 1 # grubby --set-default-index 0 # grubby --default-index 0 # grubby --default-kernel /boot/vmlinuz-4.20.0+ Grub missing If grub missing due to anyreason, and you are fall back to grub menu, you can try