How do you change the default O.S.?

Question

How do you change the default O.S. in the grub, so that windows will boot if Ubuntu is not chosen?

Do you mean default entry as Windows? When GRUB appears Ubuntu must be highlighted and gets booted up after a certain time (10s in most cases) if no action is done. I think you want to do the same for windows. Am I right? — Kulfy, Nov 28 '18 at 17:12

score 3 · Answer 1 · answered Nov 28 '18 at 17:36

The simplest way is to have GRUB remember the last boot choice made at the GRUB menu.

Edit /etc/default/grub and change/add the following lines near the top of the file...

GRUB_DEFAULT=saved # change an existing line to this

GRUB_SAVEDEFAULT=true # add this line

Then...

sudo update-grub # update the GRUB menu

reboot # reboot the system

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