x11vnc lubuntu 20.04

# sudo su

# x11vnc -storepasswd "mypassword" /etc/x11vnc.pass
# chmod ugo+r /etc/x11vnc.pass
# mcedit /lib/systemd/system/x11vnc.service

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

[Service]
Type=simple
ExecStartPre=/usr/bin/bash -c "/usr/bin/systemctl set-environment SDDMXAUTH=$(/usr/bin/find /var/run/sddm/ -type f)"
ExecStart=/usr/bin/x11vnc -display :0 -auth ${SDDMXAUTH} -forever -loop -noxdamage -repeat -rfbauth /etc/x11vnc.pass -rfbport 5900 -shared

[Install]
WantedBy=multi-user.target

# systemctl daemon-reload
# systemctl enable x11vnc.service
# systemctl start x11vnc.service