X11VNC

sudo apt update
sudo apt install lightdm
sudo init 6

sudo apt install x11vnc
sudo mkdir -p /etc/x11vnc/x11pass
sudo x11vnc -storepasswd /etc/x11vnc/x11pass/${USER}
sudo cat /etc/x11vnc/x11pass/${USER}

sudo tee /lib/systemd/system/x11vnc.service >/dev/null <<'EOF'
[Unit]
Description=x11vnc service
After=display-manager.service network.target syslog.target

[Service]
Type=simple
ExecStart=/usr/bin/x11vnc -forever -display :0 -auth guess -passwd my-password
ExecStop=/usr/bin/killall x11vnc
Restart=on-failure

[Install]
WantedBy=multi-user.target
EOF

sudo systemctl daemon-reload
sudo systemctl enable --now x11vnc.service
sudo systemctl status x11vnc.service

sudo journalctl -xeu x11vnc.service
ps wwwwaux|grep auth

Playground

sudo sed -z "s|#WaylandEnable=false|WaylandEnable=false|" -i\ /etc/gdm3/custom.conf ls -la /etc/lightdm/		cat /etc/X11/default-display-manager sudo dpkg-reconfigure lightdm sudo dpkg-reconfigure gdm3
ls -lah /lib/systemd/system|grep gdm systemctl status gdm ls -la /etc/gdm3/	sudo ps -efc | grep Xauthority sudo ps -efc | grep gnome sudo ps -efc | grep gdm	sudo ls -la /run/user sudo ls -la /etc/gdm3/Init/ sudo ls -la /run/user/1000/gdm
w -us ls -la /tmp/.X11-unix/ ls /tmp/.X11-unix|tr 'X' ':'

References

X11vnc » Ubuntu and Remote Gnome Desktop X11vnc » LightDM » Change Display Manager Install and Configure VNC on Ubuntu 22.04 Linux Virtual Display for iPad Pro
USB4 » Thunderbolt » iPad Pro iPad Pro » Specification VS Code on iPad Pro Apple iPad Pro Thunderbolt