Server upgrade from ubuntu 18 to 20

I have seen reports of it working just fine. It will mean some downtime while the OS upgrades, but it should work.

I prefer to launch a new EC2 with a clean OS and copy stuff over as described at Move your Discourse Instance to a Different Server.

(I started using Linux when kernel upgrades usually required replacing all binaries, so some of my practices may be outdated. :wink: )

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