Proxmox VE 8.1: booting into GNU GRUB after apt-get update & upgrade

Hi all,

I'm pretty new to Proxmox started in January learning about how to use it on older hardware. Decided to buy new components to build a decent server.
Today after one month of use it decided to stop booting. I did apt-get install update and apt-get install upgrade and after a reboot I get the following grub screen:

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GNU GRUB version 2.06-13+pmx1

Minimal BASH-like line editing is supported. For the first...

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