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Sep 24th, 2018
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  1. $ grep '^menuentry' /boot/grub2/grub.cfg
  2.  
  3. # Open '/etc/default/grub', and set GRUB_DEFAULT to the numeric entry value for the kernel you choose as the default.
  4. GRUB_DEFAULT=0
  5.  
  6. # Re-generate GRUB configuration.
  7. $ grub2-mkconfig -o /boot/grub2/grub.cfg
  8.  
  9. $ reboot
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