Score:0

Having problems making GRUB work

vu flag

I have a laptop with Kubuntu 22.04 and 2 SSD: an NVME on which I installed Kubuntu and another 1TB SATA. I wanted to make it also run Windows10, so I created a partition on the 1TB SSD where I installed it. However, I cannot make GRUB work. The only way I can boot into Windows is by entering Boot menu manually and selecting Windows. I tried reinstalling Grub, and a 'grub' folder appeared in '/boot/', but it still doesn't work. After that, I installed Boot Repair and there is no 'fix' option, only 'Create a BootInfo summary' (which I chose to create that summary: https://paste.ubuntu.com/p/F5tX82ysbD/). I also tried booting Kubuntu from a live image and installing boot repair there, but it did not work. Do you have any idea what could fix my GRUB?

Hi-Angel avatar
es flag
I'm having a problem understanding your issue. So, you're saying you now have both Kubuntu and Windows. But to boot Windows you have to enter a boot menu, which you don't like. But Grub menu is a boot menu, so Grub works, doesn't it? Or do you mean the BIOS/UEFI boot menu, not the Grub one? Also, I couldn't grasp: is Windows installed on the same disk as Kubuntu, or on another one?
Nmath avatar
ng flag
GRUB will only be able to boot both operating systems if they are both installed as UEFI. Or they can both be installed in BIOS/CSM/Legacy (not recommended). If one is UEFI and the other is legacy, GRUB will only boot Ubuntu.
oldfred avatar
cn flag
Similar question? https://askubuntu.com/questions/1436555/grub-cannot-boot-windows-error-not-a-valid-root-device
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