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Need help making new boot vol


I have copied my boot, root and home partitions to a larger
device but I think I need to run grub to actually make the
disk boot. All of the writeups that I can find are way too
old or just old enough that the file names for a lot of
things aren't the same as what I have.

I am running buster i386. Does anyone know of an up-to-date
recipe for doing this?

Many TIA!