Other OSs and Distros not showing up in Grub

Aurora
1

Windows and other Linux distros , not showing up in grub menu. Only Aurora.

ujust regenerate-grub

command from bazzite does not work.
_

sudo os-prober
[sudo] password for aurora_os: 
/dev/nvme0n1p1@/efi/Microsoft/Boot/bootmgfw.efi:Windows Boot Manager:Windows:efi
/dev/nvme0n1p10:blendOS:blendOS:linux
/dev/nvme0n1p6:CachyOS:CachyOS:linux:btrfs:UUID=00c7b3b9-5984-46f0-8172-c43f7323d8cc:subvol=@

aurora_os at 2403-4800-3957-3000--2 in ~ took 4s 
➜  sudo update-grub
sudo: update-grub: command not found

sudo os-prober works
but sudo update-grub does not work.
_

Any idea how to add my other OSs?

2

uBlue operating systems don’t support dualbooting as far as I know

3

Both my Bluefin PCs (a desktop and a laptop) dual boot Windows 11.

4

update-grub is a convenience script on Debian based distros

You have to use grub2-mkconfig directly here. Note of you are on composefs, you will need to modify the script to point to the correct location of root.