I had a difficult time finding good, easy to digest info online on how to do preseed a Debian install with Encrypted LVM. There’s a couple of blog posts, the Debian Wiki and some Serverfault/StackOverflow questions that led the way for me to accomplish this. (the helpful links are at the bottom of this post.)
I’ve wanted a hardware random number generator since I read about them in a tutorial for setting up a GnuPG Smart Card but the one they used wasn’t being manufactured anymore. Enter the OneRNG.