how to edit grub in terminal ubuntu 18.04

Question

Sorry for this I have seen it before but today i can not find it.

I simply want to set default=last OS selected. I can't get grub customizer set it.

https://help.ubuntu.com/community/MaintenanceFreeCustomGrub2Screen — guiverc, Jan 02 '20 at 22:53
Does this answer your question? How can I edit my Grub bootloader entries (Hide, Rename, Remove)? Preferably doing it manually, and not with a program — K7AAY, Jan 02 '20 at 23:29
Duplicate refers to using Grub customizer, even though also there, the question was for a command line approach. — vanadium, Jan 03 '20 at 10:28

score 4 · Answer 1 · edited Jan 03 '20 at 10:29

sudo nano /etc/default/grub

Add

GRUB_DEFAULT=saved                                                                                                                                           
GRUB_SAVEDEFAULT=true

After that run

sudo update-grub

Boot your desired OS.

Note that if you have a dualboot with another Linux OS, this has to be done in the system with leading GRUB2.

More info are available in the

info -f grub -n 'Simple configuration'

how to edit grub in terminal ubuntu 18.04

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