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1

How to force grub to boot only the 1st OS?

rated 0 times [ 1] [ 0] / answers: 1 / hits: 1808 / 2 Years ago, fri, april 1, 2022, 6:14:32

Good evening,

I'm running the lastest ubuntu server edition (i like the: apt-get update/upgrade ; command... a lot) and i need grub to boot only the 1st Ubuntu Server Image (every time).

The grub menu displays: 2 server images and 1 memory tests and 1 extra os from a second attached hdd

These 4 can be found listed in /boot/grub/grub.cfg (i m thinking of deleting the other entries but i ve read that the .cfg file is generated automatically if i add/remove kernel)

Can i set a GRUB_SAVEDEFAULT=true command in the /etc/default/grub ? https://help.ubuntu.com/community/Grub2#Reinstalling%20GRUB2
Or does that not apply to my configuration ?

PS. I think grub pops up because i have often power losses, but i still want grub to load the ubuntu OS... since it s sole purpose is to be a server and local access is limited.

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nstitutencert

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1 Year ago

answered 2 Years ago fatuatexen · Accepted Answer

You should never edit your /boot/grub/grub.cfg file - this is always regenerated when a new kernel is downloaded and installed.

If your Ubuntu OS is always the first in the list then the GRUB_DEFAULT=0 in /etc/default/grub is sufficient for this to be the first OS to be booted on a restart.

If your Ubuntu OS is not the first then you can set the GRUB_DEFAULT value to be equal to the menu entry value for Ubuntu OS - see the linked answer below on an example of how to find the OS value and how to add it to Grub.

Linked Question:

How do I set Windows to boot as the default in the boot loader?