XF 2.2 Xenforo not showing clean URLs on Ubuntu 20.04


I've just installed the latest version of Xenforo on a brand new Ubuntu 20.04 server, and I can't for the life of me get pretty URLs to work. I just got a 404 Not Found error. I'm not entirely sure what I am doing. Can someone offer some advice? I'm happy to provide any extra information required to solve the problem.
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