Can't create servers / No Profiles downloaded - Arch

I have been trying a few new things based on suggestions in this thread: Unable to update WebUI - #15 by hexparrot

I have tried

CXX=c++ npm install posix

and nothing seems to work. I seem to be having similar issues as the OP in the above post, but I don’t know what Docker/unRAID is to be honest, nor how that may apply to me. I am very new to Linux in general so I apologize for that. For some background, my server was built based on this guide from JM:

And I have done very little since the initial build other than setting up my minecraft servers and modifying iptables.

I have had issues with updating the webui before, and ultimately just ended up going back to original build in the above link and starting from scratch again. Usually a Ubuntu update seems to break it at some point.