Where to put GRUB?

Question

linux

I have an SSD and HDD. There are 4 partitions on the SSD: 100 MB EFI (with a letter and invisible), 16 MB MSR (without a letter and invisible), 529 MB Windows 10 NTFS and 120 GB Windows 10 NTFS itself. There are 3 memory partitions on the HDD: 16 MB of unallocated memory (after my manipulations, apparently), 900 GB of NTFS files for Windows and 35 GB for Ubuntu. All sections are listed in the order in which they are in memory (I hope I said in Russian).
So, where to put the Grab? It seems possible on the HDD, but I don’t want to lose the advantages of the SSD (although this will only concern the speed of the bootloader). Can it be installed with Ubuntu (so that it works right away) on an SSD, or does it have to be done manually?
PS: Before that: 1) I chose a place for the bootloader on the SSD when installing Ubuntu, it did not work, Windows started 2) marked EFI, grab launched Ubuntu and did not see Windows, after my manipulations I saw Windows, but did not start it. As a result, I restored the Windows bootloader, everything became the same as before installing Ubuntu (except for the fact that it just lies on the HDD).

Answer 1

If you have a UEFI system, then there must be a mount point /boot/efi pointing to the EFI partition. Did you do that? I haven’t installed ubuntu for a long time, but if there is an os-prober installation item, then it is also mandatory to install it, so that grub-mkconfig would be picked up by the Windows bootloader. Where you will put the hornbeam itself is completely unimportant.