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Thread: GRUB_DEFAULT changed on /etc/default/grub but it has no effect (I did update-grub)

  1. #1
    Join Date
    Sep 2024
    Beans
    3

    GRUB_DEFAULT changed on /etc/default/grub but it has no effect (I did update-grub)

    Hello all

    I have installed a new version of the kernel, just to test, I don't want to boot on it by default.


    I want to boot on my previous kernel, so I change


    GRUB_DEFAULT="1>2"



    In the /etc/default/grub file


    1>2 is the default ubuntu 24.04 kernek which is 6.8


    And then of course i do update-grub


    But when I reboot, select the first entry "ubuntu" stil boot on the newest kernel.


    On my /boot/grub.cfg I see :


    menuentry 'Ubuntu' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-1cd1e1a5-61f4-4207-b60f-dbf239eafb78' {
    recordfail
    savedefault
    load_video
    gfxmode $linux_gfx_mode
    insmod gzio
    if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
    insmod part_gpt
    insmod ext2
    search --no-floppy --fs-uuid --set=root 1cd1e1a5-61f4-4207-b60f-dbf239eafb78
    linux /boot/vmlinuz-6.10.7 root=UUID=1cd1e1a5-61f4-4207-b60f-dbf239eafb78 ro quiet splash systemd.restore_state=0 $vt_handoff
    initrd /boot/initrd.img-6.10.7
    }



    Grub still associates my newest kernel 6.10.7 to the Ubuntu entry...


    Any clue?


    Thanks

  2. #2
    Join Date
    May 2008
    Beans
    4,453
    Distro
    Ubuntu 24.04 Noble Numbat

    Re: GRUB_DEFAULT changed on /etc/default/grub but it has no effect (I did update-grub

    Quote Originally Posted by nicoeverquest View Post
    But when I reboot, select the first entry "ubuntu" stil boot on the newest kernel.
    If you select the first entry, you choose the latest installed kernel i.e. you have overridden your recent grub edit.
    Reboot and do not select anything.
    Your new choice should be respected if you have the correct syntax in /etc/default/grub.

  3. #3
    Join Date
    Sep 2024
    Beans
    3

    Re: GRUB_DEFAULT changed on /etc/default/grub but it has no effect (I did update-grub

    OK I understrand what you mean. I will keep the default "ubuntu" entry behavior et move my newest kernel, that I don't want to use anyway, out from the /boot directory
    thanks

  4. #4
    Join Date
    May 2008
    Beans
    4,453
    Distro
    Ubuntu 24.04 Noble Numbat

    Re: GRUB_DEFAULT changed on /etc/default/grub but it has no effect (I did update-grub

    Playing around with kernels (adding/moving/deleting) may lead to unintended consequences.
    e.g. unable to boot the PC

    Please ensure that you have recent backups of your personal data.

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