code_disaster, 
So I managed to frankenstein myself a neat Neovim setup with a bunch of useful plugins like LSP, code completion, and CMake tools.
Which works, kinda, "out of the box", if you happen to know which dependencies to install.
It works on Windows and Steam Deck Desktop.
But now the CMake tools part fails with weird error messages on Debian 12, and I have no real clue what's wrong, and how to troubleshoot it.
I suspect some nvim/plugin version conflict.