My week with Linux: I'm dumping Windows for Ubuntu to see how it goes (tomshardware.com)

I'm interested in what happens in 9 months when support ends for "Plucky Puffin".

Is there a clear and simple upgrade or do you get to repeat/redo a lot of the setup and installation you've just done?

Compatibility and continuity over the long term hasn't exactly been a strong selling point for Linux in the past.