Ubuntu 20.04 vm boots into black screen on Proxmox VE 8.1

Hello dear proxmox community,

i'm currently trying to set up a ubuntu 20.04 (mini iso) vm.
So far i was able to create a new vm, install ubuntu 20.04 and boot into the os (default display settings). For further configuration i'm downloading and executing a script that installs various additional packages and configures auto-login after boot. As soon as i reboot the vm after the script ran trough successfully i do however get booted to a black screen from which i can't seem to recover.

So...

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