So far, my decision to upgrade to 4.3.0 was a poor one. My server is down and nobody is around to help. I'm not a user of ruby. Don't use postgresql - I use mariadb mostly. That server is a LTS version of Linux Mint. Is its version too low to support 4.3.0? How do I upgrade to postgresql-16? Why did the documentation say postgresql-12, which I have? How do I fix the react errors? What does it mean that X got an unexpected version (but doesn't tell what it wants)?