Add drive/expand LUKS encrypted LVM partition on Ubuntu Server 20.04

I have an Ubuntu 20.04 server that currently has an LVM comprising 2 1tb hard drives that is LUKS encrypted. I just put a new 3tb drive in as well, and roadrunner email need to expand the LVM to encompass the new drive. I don’t have the ability to image it as I have no spare media large enough, so I’m hoping I can expand the existing LVM rather than creating a new one.

I don’t have anything super important on it, so if worst case happens and I lose anything, all I’m out is quite a few hours of work getting everything setup; but I’d prefer to not have that happen, obviously.

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