How do I reinstall grub and put in a linux hard drive?

[faint vigil]

So here's the situation: I first installed Windows 11 on my NVMe M.2 and then I installed Linux Mint on the separate SATA SSD. No problems there; however, I noticed that my grub bootloader lives in the Windows SSD. My mistake was not removing the physical NVMe M.2 on the motherboard while installing Linux Mint. I don't want to clean install Linux Mint again because I am done setting up my Linux Mint. Is it possible to migrate the grub bootloader from the Windows 11 SSD to the Linux SSD? 'Cause I have heard that Windows updates tend to mess up the GRUB bootloader. TYIA!

[merry wyvern]

Yes you can

you'll need to boot live usb,

then copy the ubuntu folder from the windows drive to the 530 MB partition on the smaller drive sda

then go in gparted, and make sure sda1 has the esp and boot flags set

then take out nvme

then boot live again, run Boot Repair tool

it will finalize loader onto sda

then test boot linux.

(from sda)

then put nvme back, delete ubuntu folder from its EFI partition

then boot back to sda linux, and do sudo update-grub so it detects Windows and updates the efi on sda1

make sure ur bios is preferring the 'ubuntu' entry on sda1, and not the old ubuntu entry on nvmep1

or just leave it all as is cuz u can just run boot repair if windows messes up. keep rescue usb in drawer

[faint vigil]

Is there a video? I don't want to mess up my partitions