Enable the autologin on the debug port

How to enable the autologin on the serial console

Create an override:

sudo systemctl edit serial-getty@ttyS0.service

Insert

ExecStart=
ExecStart=-/sbin/agetty --autologin username --noclear %I $TERM

Save and exit

sudo systemctl daemon-reload
sudo systemctl restart serial-getty@ttyS0.service