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udippel
Asked: 2024-09-14 23:32:26 +0800 CST

Grub menu doesn't show any longer

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Since yesterday, my grub boot menu doesn't show any longer. 24.4.1. The PC boots straight into kubuntu. The Partition should be there, however, since sudo update-grub shows:

Sourcing file `/etc/default/grub'
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-6.8.0-44-generic
Found initrd image: /boot/initrd.img-6.8.0-44-generic
Found linux image: /boot/vmlinuz-6.8.0-41-generic
Found initrd image: /boot/initrd.img-6.8.0-41-generic
Found memtest86+x64 image: /memtest86+x64.bin
Warning: os-prober will be executed to detect other bootable partitions.
Its output will be used to detect bootable binaries on them and create new boot entries.
Found Windows 10 on /dev/sda1
Adding boot menu entry for UEFI Firmware Settings ...
done

Also at cold boot, no menu shows. The data in the W10-partitions seem to be there, I can mount them and read them.

What to do?

boot

1 Answers

  1. Best Answer

    For an UEFI system (which yours is) you can get the grub menu to show by pressing ESC during boot. (For a standard install you must be running grub as its an integral part of the boot process.)

    I suspect you have changed /boot/grub/grub.cfg in the past and it has got updated as is built automatically from within ubuntu

    Files in `/etc/default/grub` & `/etc/grub.d/XX_XXXX` -->> /boot/grub/grub.cfg

    To get the grub menu to show by default you need to update either one of the first two.

    In /etc/default/grub make the change

    GRUB_TIMEOUT_STYLE=hidden # hidden --> menu

    GRUB_TIMEOUT=0 # 0 --> 10

    In /etc/grub.d/ an example would be /etc/grub.d/30-os_prober

    At line 337: -

    set timeout_style=menu
if [ "\${timeout}" = 0 ]; then
  set timeout=10

    I think this is the default?

    You have enabled this to boot WIN10.

    If this is so then the grub compiler grub-mkconfig used to create /boot/grub/grub.cfg could possibly be crashing before getting to it. Have you modified any of the files in this directory /etc/grub.d I wonder?

    I hope some of this helps

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