How to keep a Linux GUI from starting up by default on boot

For quite a while now I’ve been stuck trying to create a Laptop/Server on Linux. I’m talking about a laptop/server (it does both things), not a “server built on a laptop”. Why? Well, I have an old laptop (it’s so damn old it’s a Centrino) that I repurposed as a home server. That’s what it does 90% of the time. And for the rest of my day to day work, I use a desktop. But, if I ever need to go on the road, I’m stuck with no PC. I…

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