[Solved] Multi-boot distros missing from GRUB after a recent update

[debian-2019]

After a recent update all the other distros (including Windows) in my multiboot setup are now missing in the GRUB menu. Only Debian 12 is present in the GRUB menu. I think I made a mistake checking both selection boxes during the update. I selected /sda and /sda7 (where Debian 12 resides).

Is there a way to safely recover the original GRUB menu?

[debian-2019]

I have found the fix...

First, I found out I needed to edit the grub config file:

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sudo nano /etc/default/grub

...Inside the file, I enabled the line that says...

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GRUB_DISABLE_OS_PROBER=false

...That's it. And then I updated the grub:

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sudo update-grub

Upon reboot of the machine, all the missing boot paritions are back.

[theflash]

Thanks, it helped