Fix Ubuntu Install (Kernel Panic)

I have a Plex install on a Ubuntu server with Hetzner, which has stopped working. I updated Plex last night, and followed with apt-get update, upgrade, dist-upgrade and a reboot. After which the server is no longer working. According to Hetzner Support it’s in kernel panic. They’ve put the server in rescue mode and connected a KVM console to help me fix the problem, but I have no clue how to proceed. I need someone to log onto my server, diagnose and fix the kernel panic issue. I’m hopeful it will be simple for someone who actually knows what they’re doing!