I followed all the steps in the documentation, and here is where I am now.
I have 2 nodes and 1 client, on the client I have both machines and their IP Addresses connected.
One of the nodes (Windows) connects and says synced (on the node itself, the status doesn't show up on the host/client).
The other node (Ubuntu) doesn't show it's status on the node itself, nor the client.
Not only that, I had to create 3 nodes, because the Linux one kept changing it's IP to some random other IP address (that's not even on my home network), but I fixed that by creating a 3rd one and adding my Linux machine.
Then, every time I press the connect button on the client, the laggier and laggier Blender gets.
And finally, when I press render still, nothing happens at all. None of the machines do anything.
I'm using Crowdrender v0.2.5 for Blender 2.8x and 2.9x on all the machines, and all the machines are running Blender 2.91.0
Can anyone help with this? This project seems really cool, but it just doesn't work for me.