#1 2026-04-05 17:41:14

MoeJoe

Member

Registered: 2020-09-13

Posts: 11

DualBoot: Windows update removed grub menu

I have a Yoga 7 2-in-1 16IML9 which was dual booting Win 11 and BL Carbon. I applied a Windows update which removed the grub menu. Now, when I boot I go right into Windows and never see the grub menu.
Running

lsblk

from a live USB boot I can see the all Windows and BL partitions.
How do I reinstate the grub menu and dual boot?

unklar

Back to the roots 1.9

From: #! BL

Registered: 2015-10-31

Posts: 2,937

Re: DualBoot: Windows update removed grub menu

^Start with the BL-Carbon Live System (Stick, CD)
Open a terminal and chroot into the system:

lsblk -fp

Mount the appropriate partition(s):

sudo -s

the root system / of carbon

mount /dev/sdXY /mnt

optional if available

mount /dev/sdXY /mnt/boot

or

mount /dev/sdXY /mnt/boot/efi

for i in /proc /sys /dev /dev/pts; do mount --bind $i /mnt$i; done
chroot /mnt /bin/bash

grub-install /dev/sdX

at efi

grub-install

update-grub
exit
reboot

Have fun! 

jp734

Member

Registered: 2019-05-01

Posts: 28

Website

Re: DualBoot: Windows update removed grub menu

You might be able to fix it easily with efibootmgr. Execute the following command:

efibootmgr -v

- Look for a boot entry for bunsenlabs or linux in general
- Is it activated? An * next to it means it is activated
- You can change the boot order with the following command: efibootmgr -o xxxx,xxxx,etc...

xxxx will be the number after Boot. Example "Boot0001*" . Let's say Windows is "Boot0001*" and Bunsenlabs is "Boot0002*". You can change it to boot Bunsenlabs first before Windows with the followng command:

efibootmgr -o 0002,0001

After executing the command, you should see something like:

Boot Current: 0002
Boot Order: 0002,0001,etc.....
Boot0001* Windows....
Boot0002* Bunsenlabs... (or it could be something else)

This will try to boot Bunsenlabs first. If it fails, it will automatically try to boot whatever is next on the list. In this case, Windows

Last edited by jp734 (Today 10:49:20)