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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?

udippel
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1 Answers1

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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

david
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