It would also be nice to get everyone's opinion on two things:

1. I seem to have trouble locating a printer (for backups) which is supported by open source drivers (http://www.openprinting.org/printers) and doesn't have WiFi - any recommendations? All new printers are so "smart" I guess I'll call them, just want a "dumb" printer...

2. For long term bulk savings - Legacy or Segwit addresses?

I initially tried to use apt-get, but it said "E: Unsupported file /path/to/python-qt4.deb given to command line". I'm assuming this was because of the missing pre-requisites - right? Like Carlton Banks mentioned, the only way for me to know which pre-requisites were missing was to run dpkg, and then it gave me a list.

Ok, then I'll always stick with dpkg for offline machine. Thanks for this information, good to know.

Thanks so much for all this information, much appreciated - I have successfully installed all dependencies and have Armory running.  Using the dpkg command was certainly helpful to identify the dependency pre-requisites.

Armory is running really smooth, what an amazing program. Very greatful to have this!!

When installing Armory updates in the future - do I just run 'sudo dpkg -i' on the new armory.deb file? Do I then need to remove the old version or anything?

Also, what's everyones opinion for long term bulk savings - Legacy or Segwit addresses?

Thanks for the assistance PhoenixFire.  Similar to what bob123 mention, I was told to copy packages and other files from /var/cache/apt/ from the networked machine to the airgapped one (would have to do that as root, using commands `sudo cp -ax source_folder destination_folder`, it won't work on FAT32 USB, it has to be formatted with a Linux filesystem so that permissions are retaine), but not guaranteed to work. 

I just don't know how to do this, and figured I was just doing something wrong or needed an offline bundle or something...

Thanks bob123 and goatpig.  I conferred with the Purism support staff to implement these command line recommendations in PureOS, and was told that this will not work on PureOS - and even trying is far beyond my technical ability.  They provided some complex recommendations which require root privilege but said even that is not guaranteed to work - things I don't even understand, I don't want to ruin my machines; I can't be messing around with root commands.

Is there an offline bundle for installing Armory on the offline machine?  (Wouldn't that solve this issue?)

Thanks!!

Hi goatpig. Thanks for this information, I'm not sure how to implement this procedure - looks like I have some research to do... I don't know much about Linux or command line. Is this difficult to accomplish?

Thanks so much for all your work on Armory!!!

Hello.

I'm in the process of trying to setup an airgapped Armory setup, and am having issues with how to install Armory on the offline machine. Both computer are running pureOS.  So far I have installed Bitcoin Core 0.18.0 and Armory 0.96.5 on my online computer and seem to have everything working - Armory is online and connected. During my installation, I ran into a dependency issue for python-qt4 and python-psutil, so I had to run sudo apt install for both of those.  So my question is: how am I suppose to install the armory.deb file on my offline computer since I'll be missing these 2 dependencies?

I'm new to Linux and Armory, so assistance would be much appreciated. Thanks!!