Grub rescue unknown filesystem

I have one last doubt. I already have grub installed on Manjaro, do I have to install grub for another OS on the same disk?

Every OS uses it’s own Grub in the ESP as bootloader, back in the Legacy BIOS mode there was only 1 grub to use.
Nowerdays they all use different ones…

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If you install the other OS in the same mode as Manjaro, i.e. in UEFI mode you don’t need to install grub’s boot loader for that systems, you usually only need to run

sudo update-grub

in Manjaro to generate an boot menu entry. Manjaro’s grub can boot most of the other Linux systems, that’s not true otherway around.

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