I need some help. I recently upgraded to the newest version of Ubuntu and now Bitcoin Core will shut down while I'm at work. I have the GUI setup to automatically start. Does anyone know why, and how I can fix this?

I did fuck around and add a user that was specifically for running Core before I upgraded the OS. I tried to run bitcoind. I thought it was working, but I was unsure. I said fuck it and deleted the user, and decided to just run Core GUI like I had been doing. Then a couple days later I upgraded OS. Now Core shuts down. Not sure if it's the upgrade or my fault. Probably my fault lol, I'm kinda retarded when it comes to computers.