Results 1 to 2 of 2

Thread: How to fix two GRUBs due to multiple Linux installations

  1. #1

    Default How to fix two GRUBs due to multiple Linux installations


    Up until yesterday I was using Arch for the best part of the year, but I decided to try Open Suse Tumbleweed because it seems to be more stable and organized. I installed it using an USB stick and on top of my old Windows installation (I actually erased all Windows partitions using GParted). Now I have two GRUBs installed, and an invalid Windows Boot Manager entry.

    I would like the help of someone more experience with GRUB and boot entries to fix this. The output of efibootmgr is the following:

    BootCurrent: 0002
    Timeout: 0 seconds
    BootOrder: 0002,0001,001F,0000,0019,001A,001B,001C,001D,001E,0020,0022,0021,0023,0024
    Boot0000* Windows Boot Manager
    Boot0001* GRUB
    Boot0002* opensuse-secureboot
    Boot0010 Setup
    Boot0011 Boot Menu
    Boot0012 Diagnostic Splash Screen
    Boot0013 Lenovo Diagnostics
    Boot0014 Regulatory Information
    Boot0015 ThinkShield secure wipe
    Boot0016 Startup Interrupt Menu
    Boot0017 Rescue and Recovery
    Boot0018 MEBx Hot Key
    Boot0019* USB CD
    Boot001A* USB FDD
    Boot001B* NVMe0
    Boot001C* NVMe1
    Boot001D* ATA HDD0
    Boot001E* ATA HDD1
    Boot001F* USB HDD
    Boot0020* PXE BOOT
    Boot0021* HTTPS BOOT
    Boot0022* LENOVO CLOUD
    Boot0023 Other CD
    Boot0024 Other HDD
    Boot0025* IDER BOOT CDROM
    Boot0026* IDER BOOT Floppy
    Boot0027* ATA HDD
    Boot0028* ATAPI CD

    If I boot to opensuse-secureboot, I see the custom GRUB of Tumbleweed with the options to boot to Tumbleweed or Windows. If I boot to GRUB, I see the Arch GRUB with the options to boot to Arch or Windows.

    I have a couple of questions (if that's ok):

    • How to delete the invalid entries?
    • How did that happen
    • How can I just use one GRUB to boot to either Arch or Tumbleweed?
    • Is there any difference between the two GRUBs installed?

    Thank you so much in advance! I'm eager to fix this - I went to sleep yesterday with an itch haha.

  2. #2
    Join Date
    Aug 2010
    Chicago suburbs
    Blog Entries

    Default Re: How to fix two GRUBs due to multiple Linux installations

    How to remove stale entries might depend on your BIOS (UEFI firmware).

    To remove that "Grub" entry (apparently an "arch" entry) you could use (as root)
    efibootmgr -b 0001 -B
    That would work on all of my systems except for my Lenovo box, which would put that entry back. I think I can permanently remove then entry in the BIOS settings of that computer. Or I can remove the entire directory
    rm -rf /boot/efi/EFI/grub
    And then, if I use "efibootmgr" to remove the entry, the BIOS won't put it back.

    NOTE: I don't know whether that is the entry you wish to remove. That's just an illustration. Most of your boot entries are for hardware or other options, and those are managed by your BIOS. You probably can't remove those.

    You can also change the boot order.
    efibootmgr -o 0001,0002,001F,0000,0019,001A,001B,001C,001D,001E,0020,0022,0021,0023,0024
    would put the "grub" entry first. And again, on my Lenovo box that doesn't work. After reboot, the BIOS changes the order back. If I want to change the order, I have to do that in BIOS settings.

    So, getting back to what you probably wanted to do:
    rm -rf /boot/efi/EFI/Microsoft  ## remove that directory
    efibootmgr -b 0000 -B   ### remove that entry
    Those should be run as root.

    When running openSUSE, you can use:
    grub2-mkconfig -o /boot/grub2/grub.cfg
    to rebuild the menu. After that, I should have an entry to boot arch. If that doesn't do the job, you might need to add an entry to "/etc/grub.d/40_custom".

    When running arch, the equivalent command is probably:
    grub-mkconfig -o /boot/grub/grub.cfg
    although that depends on how you setup arch

    When I last installed arch, I think I had it booting from a compressed grub archive in the EFI partition, and maybe the update on openSUSE won't find that to add an entry for arch.

    You have not provided much actual information about your system. So I have mostly been guessing. I'm really only guessing that it is a Lenovo, and I am guessing that it might behave similarly to my Lenovo. Provide more detailed information and ask more specific questions if you need more detailed help.

    I should note that where I wrote:
    efibootmgr -b 0000 -B
    you could instead use:
    efibootmgr -b 0 -B
    You don't need to use 4 digit numbers. I use 4 digits in examples because that better suggests what I am referring to.
    openSUSE Leap 15.2; KDE Plasma 5.18.5;

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts