One GRUB to rule them all,
One GRUB to find them,
One GRUB to bring them all,
And may OS-Prober bind them.
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Who invented it? 
Ok, off topic, maybe the last grub repair dos the trick 
Must be Garuda, Ubuntu do not find Garuda, right?
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The post above is a copy of my earlier post.
Can you please explain why I am asked to wait for many min because I am a new member. This is only my second post for today. How many posts are allowed per day.
The forum software use discourse so the rules for new forum members TL0 (TL=trust level) are always the same. After some days you got TL1 and you can post more 
@rang =
Created 1 day ago
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Yes. Ubuntu does not find Garuda.
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Every distro installs it’s boot loader automatically in that disk. Not possible to have one boot loader for 3 distros. While booting OS set as first priority in the bios loads it’s boot menu. During any distro install, installer runs the OS-prober and recognises the other OSs.
All said
Only one is possible, use Garuda as the last installation.
Maybe use live Garuda-ISO and chroot to repair grub.
The opposite is true.
When using an MBR disk (not GPT), only one can load for each disk. Then, for different disks, the choice of which one will boot is controlled from BIOS.
In UEFI/GPT it is different.
That’s why technical details are required for the proper advice/solution.
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