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alle_meije
Asked: 2023-12-27 19:49:40 +0800 CST

Grub not detected after Kubuntu install

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I have a pc with an MSI B550 Gaming Plus motherboard, with Windows 10 on it.

After trying to install Kubuntu with different ways to partition the SSD (install windows using the whole disc and have Kubuntu resize it, install windows on part of the disc and manually make a new partition for Kubuntu, etc.), none of these seems to install grub2 in a way that is detected.

I've tried boot loader installation to /dev/sda as well as /dev/sda1 (the ESP used by windows), but it does not seem to put grub2 there.

When I run BCDedit in Windows, it only shows the windows boot manager and the windows boot loader.

As the Kubuntu installation completes without errors I assume that grub2 is placed somewhere, but not not where the motherboard setup 'MSI click' can find it.

Is there a way to change this without reinstalling Kubuntu or windows?

EDIT: using a usb flash drive with boot-repair and the advanced option 'backup and rename Windows EFI files' I can boot into grub2, but then the Windows boot option does not do anything, it returns to the menu.

Maybe something is wrong with the menu option? It now reads:

setparams 'Windows Boot Manager (on /dev/sda1)'
insmod part_gpt
insmod fat
set root='hd0,gpt1'
if [ x$feature_platform_search_hint == xy ]; then
  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt1 --hint-efi=hd0,gpt1 --hint-baremetal=ahci0,gpt1  409C-954a
else
  search --no-floppy --fs-uuid --set=root 409C-954a
fi
chainloader /EFI/Microsoft/Boot/bootmgfw.efi

What I understand of this makes sense. But then there seems to be a choice between moving the Windows files, getting grub2 but no Windows, and using boot-repair without moving the files and not getting grub2?

dual-boot

1 Answers

  1. Best Answer

    Windows is not designed to be multiBoot capable except for multiple Windows. It does not do other operating systems.

    Grub will boot other systems, but Windows cannot be hibernated, fast startup on, nor encrypted (bitlocker).

    Both systems have to be in same boot mode or now almost all systems are UEFI, so both systems need to be installed in UEFI boot mode to gpt partitioned drives.

    One advantage of UEFI, is that you should always be able to boot from UEFI boot menu. But always have good backups and both an Ubuntu live installer and windows repair/recovery drive to make repairs, if needed.

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