Would it be an idea to create an Ubuntu/Debian repo for Armory, and add this to the system's repos when the Armory package is installed? Then, after installing Armory once, all updates will just be installed along with the system updates. The Ubuntu Google Chrome package does this. It's pretty handy, means you only have to install once and not worry about updates after that.
This will be great if you exactly know the repo url and you have to also know alternatives so if it fails, it will retry the other repo. the first time you install it, I think it will chose the updated one.
While on this topic, can you guys tell me which miner dyou use when using ubuntu?