GRUB no showing all OS

When I boot and "DEL" key into the UEFI settings I am able to activate the booting for either of my OS, Being Bazzite (first installation) and Fedora (second installation). I have Bazzite on a single M2 NVMA and then Fedora on a separate M2 NVME. If I boot without touching any keys I get to the GRUB page. It shows Bazzite, Bazzite, windows and UEFI.
Firstly, I don't need two Bazzite options, secondly and more importantly I need GRUB to show the Fedora option.
How do I update/change GRUB?

皇

皇家海星•12/7/25, 11:44 AM

make sure bazzite is the first boot option
boot into bazzite
mount the drive with fedora on it(i.e. open dolphin/nautilus/any file explorer and click on the drive)
open terminal

run

ujust regenerate-grub

ujust regenerate-grub

皇

皇家海星•12/7/25, 11:45 AM

bazzite must have 2 boot entries in grub due to how rpm-ostree's atomic updates work

皇皇家海星 1. make sure bazzite is the first boot option 2. boot into bazzite 3. mount the ...

BuckrodgerOP•12/7/25, 12:27 PM

This might have worked.

皇

皇家海星•12/7/25, 12:28 PM

ujust

ujust

, not

u just

u just

皇皇家海星 `ujust`, not `u just`

BuckrodgerOP•12/7/25, 12:29 PM

It said that it found the Fedora and then during re-boot the GRUB entries are the same. So, thanks, but problem still remains.

皇

皇家海星•12/7/25, 12:29 PM

make sure you have bazzite as the first boot entry in UEFI

皇皇家海星 make sure you have bazzite as the first boot entry in UEFI

BuckrodgerOP•12/7/25, 12:33 PM

Yeah, I have it correct with Bazzite first.
Note: I have GRUB 2.12. Can this be updated?

BuckrodgerOP•12/7/25, 12:36 PM

I get the feeling that I need to do something in the command line within GRUB.

皇

皇家海星•12/7/25, 12:36 PM

nah, grub is up to date

BuckrodgerOP•12/7/25, 12:37 PM

I forgot to mention. If I enter UEFI and select Fedora )re-boot) then the next time I see the GRUB options they are all Fedora (no BAzzite). Everything resets back to Bazzite only upon restart.

皇

皇家海星•12/7/25, 12:38 PM

Is your fedora an atomic spin?

皇

皇家海星•12/7/25, 12:39 PM

so something like silverblue or kinoite

皇

皇家海星•12/7/25, 12:45 PM

The reason you don't see bazzite is because the grubs are separate

皇皇家海星 The reason you don't see bazzite is because the grubs are separate

BuckrodgerOP•12/7/25, 12:56 PM

So, maybe I just accept that to use the non-main OS I have to go via the UEFI booting method.

皇皇家海星 Is your fedora an atomic spin?

BuckrodgerOP•12/7/25, 12:56 PM

It's the Fedora 43 desktop version.

皇

皇家海星•12/7/25, 1:18 PM

yeah safest method would be to use the UEFI boot menu

皇

皇家海星•12/7/25, 1:19 PM

still not sure why grub wouldn't show the fedora entry though

HikariKnight•12/7/25, 1:47 PM

well documented by us that dual booting with other linux distros especially fedora is not supported.

皇

皇家海星•12/7/25, 1:53 PM

I see that only fedora atomic images are mentioned in the dual boot docs page
Should I go and add a section for that?

Dual Boot Preliminary and Post-Installation Setup Guide - Bazzite D...

Bazzite is a custom image built upon Fedora Atomic Desktops that brings the best of Linux gaming to all of your devices.

HikariKnight•12/7/25, 2:27 PM

to my knowledge its always been problematic, but i dont ever dual boot

HikariKnight•12/7/25, 2:28 PM

so i would say double check with kyle if i remember correctly

皇皇家海星 I see that only fedora atomic images are mentioned in the [dual boot docs page](...

BuckrodgerOP•12/7/25, 10:14 PM

When a dedicated drive is feasible, this method is recommended.
Install Bazzite on a separate internal or external drive.
Install the other operating system on a drive (like Windows)
Install Bazzite on a second drive
Set Bazzite as the default in your boot order (optional)
If you install Windows second, you should disconnect the Bazzite drive to prevent using the Windows installer of using its EFI partition. You can also install Windows to an external drive with Windows-to-Go using Rufus to dual boot if you do not have an internal drive available.
---------------
If you install Windows after Bazzite, you can restore Bazzite bootloader with the Bootloader Restoring Tool in the Live ISO.
----------------
If I installed Fedora after Bazzite, both on separate NVME drives, then logically, I would need to use the above Bazzite bootloader restoring Tool to somehow return or make possible for the Bazzite boot GRUB window to show the Fedora OS...correct interpretation?

HHikariKnight well documented by us that dual booting with other linux distros especially fedo...

BuckrodgerOP•12/7/25, 10:20 PM

If this is the case then I should accept the inconvenience and just use UEFI to boot Fedora.

GRUB no showing all OS

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