proxmox add DE to allow autologin and an X server

gistfile1.txt

# install lightdm 
apt install lightdm

# Config Auto Login for "Root" (Definitely it is not a good practice, but do what you want if you dont have a seperate user setup)
# Could also install a lightdm greeter and have a regular graphical login screen that transitions to terminal.
nano /etc/pam.d/lightdm-autologin
# Find #auth and comment out this line --->
# required pam_succeed_if.so user != root quiet_success

nano /etc/lightdm/lightdm.conf
# add these 3 lines to the [Seat:*] section (or do a seat-deaults file or whatever)
autologin-user=root
autologin-user-timeout=0
autologin-session=lightdm-xsession

# Add New Group for autologin and add root (or other properly set up proxmox+PAM user) to that group
groupadd -r autologin
usermod -aG autologin root

This is useful if you have some GPU's and you need to have an X server running so that you can overclock the cards in your proxmox host. You could also install a lightdm greeter and let someone login like normal, but this is an example for autologin.