Windows 11, Ubuntu Dual Boot GRUB


S

Sandi1987

Guest
I have Dual Boot Windows 11 and Ubuntu. Will Windows Updates removed GRUB and EFI Partition or if i re-install Windows?
 
Last edited by a moderator:

My Computer

No. grub-install will install GRUB on [ESP]/EFI/grub or [ESP]/EFI/ubuntu.
But, after you will install (or update) Windows, Windows will register on the UEFI boot manager, hence you will not boot to Ubuntu.

{EDIT}
 

My Computer

System One

  • OS
    EndeavourOS, Windows 11 Pro
    Computer type
    PC/Desktop
    Manufacturer/Model
    custom PC
    CPU
    Core i5 8400
    Motherboard
    Gigabyte B360M-HD3
    Memory
    8gb DDR4-2400
    Graphics Card(s)
    iGPU
    Sound Card
    Realtek
    Monitor(s) Displays
    some generic 1080p 75hz monitor * 2
    Screen Resolution
    1080p * 2
    Hard Drives
    GIGABYTE NVMe SSD 256GB (GP-GSM2NE3256GNTD)
    Internet Speed
    200MBit/s
    Antivirus
    WD
I found solution.

Convert Windows 11 from UEFI to Legacy, install Ubuntu and convert back to UEFI after Ubuntu installation.
 

My Computer

I found solution.

Convert Windows 11 from UEFI to Legacy, install Ubuntu and convert back to UEFI after Ubuntu installation.
Unnecessary. Install Windows on UEFI, and then install Ubuntu on UEFI, hence you will boot straight to GRUB and you will see:
Code:
Ubuntu
Advanced Options for Ubuntu
Windows Boot Manager (on /dev/sda2)

To make sure Windows will boot to GRUB even after Windows Updates, use this command on Administrative Command Prompt:
Batch:
bcdedit /set {bootmgr} path \EFI\ubuntu\shimx64.efi

If you can't see Windows in the Boot options, type this command in the Linux Terminal:
Code:
$ sudo update-grub
1653874397118.png
 
Last edited:

My Computer

System One

  • OS
    EndeavourOS, Windows 11 Pro
    Computer type
    PC/Desktop
    Manufacturer/Model
    custom PC
    CPU
    Core i5 8400
    Motherboard
    Gigabyte B360M-HD3
    Memory
    8gb DDR4-2400
    Graphics Card(s)
    iGPU
    Sound Card
    Realtek
    Monitor(s) Displays
    some generic 1080p 75hz monitor * 2
    Screen Resolution
    1080p * 2
    Hard Drives
    GIGABYTE NVMe SSD 256GB (GP-GSM2NE3256GNTD)
    Internet Speed
    200MBit/s
    Antivirus
    WD
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