What I'm looking to do is to have Ubuntu 22.04 encrypted on an external SDD.

I'd prefer for this encrypted 22.04 to be able to run on multiple PCs but I'll settle for it to only be able to run on the one I'm setting it up on if absolutely necessary. If the additional info helps, the computer I'm using has Windows on it and I'd like to keep that OS. Id rather not have two operating systems on the internal HD either, I just want to use the new encrypted Ubuntu when I have the external SSD plugged in.

Thanks ahead of time for any help or tips...