Thanks Carlton - to my understanding, PureOS is a fork of Debian Testing.

Also, I ran "sudo dkpg -i armory.deb" on my online and offline computer to install armory.  Downloaded all required dependencies with "sudo apt install dependencies" for all required dependencies on the online computer, and then transferred them to the offline machine for install the same way.  Should I do the same thing in the future when upgrading Armory?

Really appreciate this helpful discussion!