My octopi UI died (web UI not running) however octoeverywhere still runs and I'm able to print using that.
I can access PI using SSH but I'm a noob when it comes to linux.
What did you already try to solve it?
Just did a reboot a few times
Have you tried running in safe mode?
Yes
Did running in safe mode solve the problem?
No
Systeminfo Bundle
You can download this in OctoPrint's System Information dialog ... no bundle, no support!)
Well, the UI is dead, so no sysinfo bundle, and I cannot use octoeverywhere to fetch it since that redirect me 127.0.0.1 and even with the correct IP the http is dead anyway.
I have no clue how to create a system info from CLI and transfer the file to my PC.
Additional information about your setup
OctoPrint version, OctoPi version, printer, firmware, browser, operating system, ... as much data as possible
It does show that something is running on port 5000, which would be OctoPrint. So OctoPrint is still running (and the fact you can get into it via OctoEverywhere supports this). Usually on OctoPi Haproxy runs on port 80 to proxy both OctoPrint and the webcam streaming to one place. So maybe that has died.
Maybe check sudo systemctl status haproxy.service to see if it is complaining of an error?