Heya! I know it's been, oh god, two months, but I figured out why it wasn't compiling. Turns out even though I checked Linux support when installing UE5, it never actually installed the SDK..
Got that working today, and apparently a plugin I use all the time also doesn't work with Linux builds, so I'll be working on fixing that, either by getting the plugin to compile for Linux or by replacing the plugin's code. So sorry for the wait, been a hell of a few months for me.