Plugins from custom repositories not installing

[stephgobrr]

I've been trying to install some plugins that I found from awesome-jellyfin (intro-skipper, customlogoplugin, and newsletters), but whenever i try to install them and restart the server, they simply aren't installed. No indication that they were installed either. This only happens with non-official repos. 
I'm running Ubuntu Server, if that helps.

[crobibero]

Please provide logs.

[stephgobrr]

Please provide logs.

My log is larger than 200 kb, so I just uploaded it to drive.

https://drive.google.com/file/d/17-f9eM7...sp=sharing