If you are prompted to upgrade your Ubuntu server, or are otherwise considering it, we recommend against doing so.
Upgrading the Ubuntu release will often break dependencies that our server software relies upon to keep running and communicate with machines.
The Lamassu server software is designed with Ubuntu Server 16.04 x64 in mind.
Additionally, you may see messages in your server to update npm or other such tools. These aren't prompted by us, and we also don't recommend them in order not to break compatibility.
Any updates that should happen to the server-side software will be handled either in our upgrade scripts, or in articles posted to our support portal.