x11vnc systemd service for HedgeHog4/Hog4OS to allow remote control of the light board.

x11vnc.service

[Unit]
Description=Start x11vnc at startup.
After=multi-user.target

[Service]
Type=simple
ExecStart=/usr/bin/x11vnc -display :0 -norc -forever -loop -noxdamage -repeat -rfbauth /etc/x11vnc.pwd -rfbport 5900 -shared -o /var/log/x11vnc.log

[Install]
WantedBy=multi-user.target

Gain root access with single user mode https://www.itzgeek.com/how-tos/linux/debian/how-to-reset-root-password-on-debian-9-stretch.html

Once booted, setup FixtureNet with an IP Address in the Control Panel.

Press ctrl-alt-3 to enter a TTY and login as root.

Verify internet access with ping 1.1.1.1 - if no internet access, you may have to replace /etc/network/interfaces with the following.

# Hog 4 network interfaces

# The loopback network interface
auto lo
iface lo inet loopback

Update /etc/apt/sources.list with the following:

deb http://ftp.debian.org/debian stable main contrib non-free
deb http://security.debian.org/debian-security stretch/updates main contrib non-free
deb-src http://security.debian.org/debian-security stretch/updates main contrib non-free

Install x11vnc:

apt update
apt install x11vnc

Feel free to setup SSH for remote access.

Add x11vnc.service to /etc/systemd/system

systemctl daemon-reload
systemctl enable x11vnc

You should be able to reboot to have it started on port 5900.