Upgrade to Debian 13 (trixie)

sudo apt update

sudo apt upgrade

sudo sed -i 's/bookworm/trixie/g' /etc/apt/sources.list

sudo apt update

sudo apt upgrade

sudo reboot

Disable Proxmox firewall temporarily

When you mess up the Proxmox firewall setup and you can't access the server...

pve-firewall stop

This stops the firewall until next reboot or update of any packed what restart the pve-firwall.

If you like to disable it permanently , you can do this in the /etc/pve/firewall/cluster.fw

set enable: 1 to 0

Citation: https://forum.proxmox.com/threads/disable-firewall-from-command-line.29091/

Switching Debian boot mode between text and GUI

To boot into text mode:

sudo systemctl set-default multi-user.target

or to boot into GUI mode:

sudo systemctl set-default graphical.target

Reboot the system