Restoring (grub?) boot menu on ~10-year-old dual-boot Win7/Ubuntu?

I have a computer which had dual-boot Windows 7 & Ubuntu on it about 10 years ago.

10 years ago, I backed up the data I wanted from the Ubuntu system, and had the makers of the computer clone the Windows 7 system to a fresh SSD, but when they did, the (grub, IIRC) bootloader was not preserved.

So now the system just boots to Windows 7, and there is a dormant Ubuntu partition on one of the drives.

I would now like to dual boot Windows 7 / Linux on the computer again, and am wondering what I would need to do to get that to work? I imagine I can just run some installer somehow, but I don't know where to look.

(I'm also wondering if maybe it might be better/easier to just run a Linux installer and tell it to just wipe and use that partition, since that's going to be a mighty old version of Ubuntu now, and I might rather run Mint in any case.)